Apparatus and method of generating wide bandwidth signal

FIELD: physics, acoustics.

SUBSTANCE: invention relates to audio signal processing devices. An input signal is presented for a first band with first resolution data and for a second band with second resolution data, the second resolution being lower than the first resolution. A patch generator generates a first patch from the first band of the input signal according to a first patch generation algorithm and generates a second patch from the first band of the input signal according to a second patch generation algorithm. Spectral density of the second patch generated according to the second patch generation algorithm is higher than the spectral density of the first patch generated according to the first patch generation algorithm. A coupler merges the first patch, the second patch and the first band of the input signal to obtain a wide bandwidth signal. The apparatus for generating a wide bandwidth signal scales the input signal according to the first patch generation algorithm and according to the second patch generation algorithm or scales the first patch and the second patch such that the wide bandwidth signal satisfies the spectrum envelope criterion.

EFFECT: wider bandwidth of an audio signal.

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Implementation according to the invention relate to processing of the audio signal and, in particular, the device and method of generating a signal with a wider bandwidth of the input signal, the device and method of receiving a signal with reduced bandwidth, based on an input signal and a sound signal.

Perceptual adapted coding of audio signals, providing a significant reduction in data transfer speeds for efficient storage and transmission of these signals have been widely used in many fields. There are many coding algorithms, such as MPEG 1/2 Layer 3 ("MP3") or MPEG-4 AAC (Promising audio coding). However used for this encoding, especially when working at very low bit rate, can lead to deterioration in subjective sound quality, which is often called mainly forced by limiting the bandwidth of the audio signal to be transmitted, on the side of the coding device.

As is known from WO 9857436 to expose the audio signal to limit the bandwidth in such a situation, on the side of encoder and encode only the lower band of the audio signal, use high-quality audio encoder ("main encoder"). The upper bands is, however, is characterized by only very roughly, there are a number of parameters that reproduce the envelope of the spectrum of the upper band. Then on the side of the decoder is synthesized upper band. With this purpose it is proposed harmonic movement, where the lower band decoded audio signal is fed to the comb filters. The channels of the comb filters of the lower strip is connected to the channels of the comb filters of the upper strip or "patched", and each a patched signal with a limited frequency band is subjected to regulation of the envelope. Synthesizing comb filters belonging to the comb filters for special analysis, receives signals from the limited bandwidth of the audio signal in the lower band and a signal with a limited frequency band affected by the regulation of the envelope, the lower band, which is harmoniously inserted in the top bar. The output signal of the synthesizing of the comb filters is a sound signal that is advanced relative to its original bandwidth, which is transmitted from the coding device on the side of the decoder by the main encoding unit operating at very low speed data transmission. In particular, the calculation of the comb filter and paste patch in the area of the comb filters can be very time-consuming.

The simplified the major ways of extending the bandwidth of the audio signal with limited bandwidth instead use the copy function of the low-frequency parts of the signal (LF-H4) in the high frequency range (HF HF), in order to approximate the information that is missing because of the limited bandwidth. Such methods are described in Mdica, Lleida, Knieling and Okonta, "spectral band Replication, a new approach to audio coding," in 112th Congress (AES Society of engineers, sound engineers), Munich, may 2002; Smeltzer, Rama and Phenna, "Improved audio coder-decoders with SBR (BPO - register buffer memory) for digital broadcasting such as "digital World Radio (DRM)", 112 th Convention of the AES, Munich, may 2002; Tzipora, Aerate, Beckstrand and Mlotshwa, "Improving TR3 through SBR: Features and capabilities of the new mp3PRO algorithm", 112 th Convention of the AES, Munich, may 2002; international Standard ISO/IEC 14496-3:2001/FPDAM 1, "bandwidth Extension", ISO/IEC, 2002, or "Method and apparatus for bandwidth expansion of speech", Vasu Iyengar and others, U.S. Patent No. 5455888.

In these methods, the harmonic movement is not performed, but the serial signal with a limited frequency band and the lower band is entered in the serial channels of the comb filters of the upper strip. Thus, this is a rough approximation of the upper band of the audio signal. In the next step, this is a rough approximation of the signal assimilated relative to the original by post-processing using the control information is the situation, obtained from the original signal. Here, for example, the scale factors are used to adapt the envelope spectrum for inverse filtering and to add minimal noise to adapt the tone and additions sinusoidal parts of the signal for the missing harmonics, as is also described in the MPEG-4 high-performance enhanced audio coding (AAC).

In addition, further methods use the phase vocoder for bandwidth expansion. When using the phase vocoder for the spectral expansion of the frequency lines are moved farther apart from each other. If in the spectrum in which there are gaps, for example, in the quantization, they even increased when the extension. When adapting energy remaining lines in the spectrum get too much energy compared with the corresponding lines in the original signal.

Fig shows a schematic illustration of the bandwidth expansion 1300 through the use of the phase vocoder. In this example, two patches 1312, 1314 added to the low-frequency band signal 1302. Repressed RF component 1320 signal, also called frequency separation (Xover)is the low frequency level of the neighboring patches 1312, and a double frequency separation (x-over frequency) is suppressed high-frequency component of the neighboring patches is 1312 and suppressed the LF-component of the next patches 1314. The phase vocoder is a doubling of frequency lines of the low-frequency band signal 1302 to get the next patch 1312, and triples the frequency of the frequency lines of the low-frequency band signal 1302 to receive the next patch 1314. Therefore, the spectral density of the neighboring patches 1312 is only half of the spectral density of the low-frequency band signal 1302, and the spectral density of the next patches 1314 is only one-third of the spectral density of the low-frequency band signal 1302.

The concentration of energy in the bands (patches) only up to a multiple of the frequency of the lines leads to a significant change of tone, which is different from the original. Energy is still more bands (frequency lines) is summarized on the fewer remaining.

Some examples of phase vocoders and their applications are presented in the work of Frederick Nagel and Sasha DISHA "Method harmonic expansion of the bandwidth for the audio coder-decoder," ICASSP '09 and in the work of M. Puckette "Vocoder with phase synchronization". IEEE ASSP conference on the Use of audio and acoustic signal, Mohonk 1995", the rebel, A.: "Transient detection and preservation in the phase vocoder"; citeseer.ist.psu.edu/679246.html in the work of L. Laroche, Dolson M.: "an Improved version of the timeline of the sound received by FA the new vocoder", IEEE. Trance processing of speech and sound, edition 7, No. 3, str-332 and U.S. Patent 6549884.

One approach to filling gaps shown in WO 00/45379. It contains a method and apparatus to extend the original coding systems using high-frequency recovery. This application solves the problem of insufficient noise content in the recovered high range through adaptive add minimal noise. Adding noise can fill in the gaps, but the sound quality or subjective quality can be significantly improved.

The objective of the invention is to provide a concept of expanding the bandwidth of the audio signals, which improves the subjective quality of the signal with a wider bandwidth.

This is achieved through the use of a device according to paragraphs 1 and 11 of the patent formula, the audio signal according to item 14, and the method according to paragraphs 15 and 16.

The implementation of the invention provides a device for generating a signal with a wider bandwidth of the input signal. The input signal is provided to the first strip by means of data of the first resolution and the second strip through the data of the second resolution, the second resolution lower than the first resolution. The device includes a generator of patches and unifier. The generator is of aplac is formed, to generate the first patch from the first band of the input signal according to the first algorithm to create "patches", and is formed to generate a second patch from the first band of the input signal according to the second algorithm create "patches". The spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral density of the first patch generated according to the first algorithm to create "patches". A combiner is formed to combine the first patch, the second patch and the first band of the input signal to obtain a signal with a wider bandwidth. Device for the generation of a signal with a wider bandwidth is formed to scale the input signal according to the first algorithm to create "patches" and according to the second algorithm create "patches" or to scale the first patch and the second patch so that a signal with a wider bandwidth to satisfy the standard envelope of the spectrum.

Implementation according to this invention is based on the Central idea that patch with a low spectral density (which means, for example, that the patch includes intervals compared with low-frequency band of the input signal) is combined with a patch with a high spectral density (that OSN which includes, for example, the patch includes only a few intervals or do not include the gaps quite compared with low-frequency band of the input signal) to extend the bandwidth of the input signal. Both patches are generated based on the input signal, high-frequency bandwidth extension of the low-frequency band of the input signal can provide a good approximation of the original audio signal. Additionally, the first and second patches can be scaled up (by scaling the input signal) or after generation to meet the criteria of the envelope of the spectrum as the spectrum envelope of the original audio signal should be considered when restoring high-frequency band of the input signal. Thus, the subjective quality or sound quality of a signal with a wider bandwidth can be significantly improved.

In some implementations according to the invention the first algorithm create "patches" is a harmonic algorithm create "patches". In other words, the first patch is generated so that only frequencies that are integral multiples of the frequencies of the first band of the input signal, contained in the first patch. In addition, the second algorithm create "patches" may be mixing algorithm create the patch. This means, for example, that the second patch can be generated so that the second patch contains frequencies that are integral multiples of the frequencies of the first band of the input signal and frequencies that are not integer multiples of the first frequency band of the input signal. Therefore, the spectral density of the second patch is higher than the spectral density of the first patch. By combining the first patches and the second patches missing frequency lines of the first patch can be filled in the frequency lines of the second patch. Thus, the intervals of the harmonic bandwidth expansion according to the first algorithm to create "patches" can be filled with the second patch, and the sound quality of a signal with a wider bandwidth can be significantly improved.

Some of the implementation according to the invention relate to devices for receiving the signal with reduced bandwidth, based on an input signal. The device includes an identifier of the data envelope spectrum generator control data scaling patches and output interface. The identifier data of the envelope of the spectrum is formed to determine the data spectrum envelope based on high-frequency band of the input signal. The generator control data scaling patches is formed so that the gene is activated, the control data scaling patches for scaling signal with reduced bandwidth in the decoder, or for scaling the first patches and the second patches decoder so that a signal with a wider bandwidth generated by the decoder meets the criteria of the envelope of the spectrum. The criterion of the envelope of the spectrum is based on the envelope of the spectrum. The first patch is generated from the low-frequency band signal with reduced bandwidth according to the first algorithm for generating the patch and the second patch is generated from the low-frequency band signal with reduced bandwidth according to the second algorithm create "patches". The spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral density of the first patch generated according to the first algorithm to create "patches". The output interface is formed to combine the low frequency band of the input signal, the data envelope spectrum and the control data of the zoom power to receive the signal with reduced bandwidth. Further, the output interface is formed to receive the signal with reduced bandwidth for transmission or storage.

Some further implementation according to the invention relate to an audio signal that includes a first strip and second strip. The first line presents the data of the first resolution and the second is olosa presents data of the second resolution. The second resolution lower than the first resolution. The data of the second resolution based on the data envelope spectrum of the second band and the control data, scaling patches of the second strip to scale the audio signal in the decoder or to scale the first patches and the second patches decoder so that a signal with a wider bandwidth generated by the decoder meets the criteria of the envelope of the spectrum. The criterion of the envelope of the spectrum is based on the envelope of the spectrum. The first patch is generated from the first band audio signal according to the first algorithm for generating the patch and the second patch is generated from the first band audio signal according to the second algorithm create "patches". The spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral density of the first patch generated according to the first algorithm for generating the patch.

Implementation according to the invention will be subsequently described in more detail with reference to the attached drawings, in which:

Figure 1 - block diagram of a device for generating a signal with a wider bandwidth of the input signal;

Figa - schematic illustration of the generated first patch;

Fig.2b - schematic illustration of generierung is th first and second patches;

Figa is a block diagram of a device for generating a signal with a wider bandwidth of the input signal;

Fig.3b is a schematic illustration of a sinusoidal input signal with a limited level;

Figs is a schematic illustration of a half-wave rectified sinusoidal input signal;

Fig.3d - schematic illustration of the wave rectified sinusoidal input signal with a limited level;

4 is a block diagram of a device for generating a signal with a wider bandwidth of the input signal;

Figa - schematic illustration of the execution of the comb filters of the phase vocoder;

Fig.5b - detailed illustration of a filter figa;

Figs - schematic illustration of the manipulation signal with amplitude coding and signal with frequency encoding in the channel filter figa;

6 is a schematic illustration of the conversion of the phase vocoder;

7 is a block diagram of a device for generating a signal with a wider bandwidth of the input signal;

Fig is a block diagram of a device for generating a signal with a wider bandwidth of the input signal;

Fig.9 is a block diagram of a device for generating a signal with a wider bandwidth of the input signal;

Figure 10 - block diagram of the device for which Holocene signal with reduced bandwidth based on the input;

11 is a block diagram of a method of generating a signal with a wider bandwidth of the input signal;

Fig is a block diagram of a method of receiving a signal with reduced bandwidth, based on an input signal;

Fig is a schematic illustration of a known algorithm for bandwidth expansion.

Further, the same reference numbers are partly used for objects and functional units having the same or similar functional properties, and their description about rooms should also be applied to other rooms, to reduce redundancy in the description of the implementation.

Figure 1 shows a block diagram of a device 100 for generating a signal with a wider bandwidth 122 for the input signal 102 according to the implementation of the invention. The input signal 102 is presented for the first band data of the first resolution and the second band data of the second resolution, the second resolution lower than the first resolution. The device 100 includes a generator patches 110, coupled to the combiner 120. Generator patch 120 generates the first patch 112 from the first band of the input signal 102 according to the first algorithm to create "patches" and generates the second patch 114 from the first band of the input signal 102 according to the second algorithm create "patches". Spec the General density of the second patch 114, generated according to the second algorithm create "patches", higher than the spectral density of the first patch 112 generated according to the first algorithm to create "patches". A combiner 120 combines the first patch 112, the second patch 114 and the first band of the input signal 102 to receive a signal with a wider bandwidth 122. Further, the device 100 for generating a signal with a wider bandwidth 122 scales the input signal 102 according to the first algorithm to create "patches" and according to the second algorithm create "patches" or scales the first patch 112 and the second patch 114 so that a signal with a wider bandwidth 122 met the criteria of the envelope of the spectrum.

Spectral density means, for example, the density of different frequencies or frequency lines within the frequency range. For example, the frequency range from 0 Hz to 10 kHz, including the frequency with frequencies of 4 kHz and 8 kHz, has a lower spectral density than the same frequency range including the frequency with frequency 2 kHz, 4 kHz, 6 kHz, 8 kHz and 10 kHz. Since the spectral density of the first patch 112 is lower than the spectral density of the second patch 114, the first patch 112 includes intervals compared with the second patch 114. Therefore, the second patch 114 may be used to populate this the x intervals. Both patches are based on the first band of the input signal 102, both patches are associated with the characteristics of the original signal corresponding to the input signal 102. Therefore, a signal with a wider bandwidth 122 may be a good approximation of the original signal, and subjective quality or sound quality of a signal with a wider bandwidth 122 can be significantly improved by using the described concept. Thus, more energy can be distributed between the remaining lines and, for example, you can avoid unnatural sound.

For example, the first algorithm to create "patches" can be harmonic generation algorithm "patches". Therefore, the generator patch 110 may generate the first patch 112 that includes only frequencies that are integral multiples of the frequencies of the first band of the input signal 102. Harmonic bandwidth extension can provide a good approximation of the tonal structure of the original signal, but this algorithm create "patches" will leave gaps between the harmonic frequencies. These gaps can be filled in the second patch. For example, the second algorithm create "patches" may be mixing algorithm create "patches", which means that the generator patch 110 may generate the second patch 114, including C is small multiples of the first frequency band of the input signal 102 (harmonic frequency) and frequency which are not integral multiples of the frequencies of the first band of the input signal 102 (non-harmonic)frequency. Non-harmonic frequencies can be used to fill in the gaps of the first patch 112. You can also combine the whole second patch 114 (including harmonic frequencies) with the first patch 112. In this example, the amplification of the harmonic frequencies in the connection of the harmonic frequency part of the first patch 112 and the second patch 114 may be taken into account appropriately scaled first patch 112 and/or the second patch 114.

The first patch 112 and the second patch 114 include at least partially the same frequency range. For example, the first patch 112 includes a frequency range from 4 kHz to 8 kHz, and the second patch 114 includes a frequency range of 6 kHz to 10 kHz. In some implementations according to the invention repressed LF component of the frequency of the first patch is equal suppressed low-pass frequency component of the second patches, and repressed RF-frequency component of the first patch 112 is equal suppressed high-frequency component of the frequency of the second patch 114. For example, both patches include the frequency range from 4 kHz to 8 kHz.

Figa and 2b show an example of the first patch 112 according to the first algorithm for generating the patch 212 and the second patch 114 according to the second algorithm create "patches" 214. For lucaylucay figa shows only the first patch 112, and fig.2b shows the first patch 112 and the corresponding second patch 114. Figa illustrates an example 200 for the first zone 202 of the input signal 102 and the first two patches 112, generated according to the first algorithm for generating the patch 212. In this example, the patch includes the same bandwidth as the first band 202 of the input signal 102. Bandwidth may also be different. Repressed RF component 220 of the first strip 202 of the input signal 102 is indicated by frequency Xover (crossover frequency). In the example shown in figa, patches begin at a frequency equal to a multiple of the frequency separation Xover 220. Frequency lines within the first patch 112 are integral multiples of the frequency lines of the first zone 202 of the input signal 102 and may, for example, be generated by the phase vocoder. These first patch 112 include gaps in the indicators frequency missing lines in comparison with the first strip 202 of the input signal 102.

Fig.2b additionally shows an example of the 250 two corresponding second patch 114. These patches are generated according to the second algorithm create "patches" 214 and include harmonic and non-harmonic frequencies. Non-harmonic frequency lines may be used to fill in the gaps of the first patch 112. The frequency lines of the second patch 114 can be generated, for example, nonlinear distorted the eat.

Thus, the gaps may not be filled arbitrarily as, for example, when filling gaps noise. The gaps are filled, based on the data of the first resolution of the first band of the input signal and, therefore, based on the original signal.

The first band of the input signal 102 may represent, for example, low frequency band of the original audio signal encoded with high resolution. Second band of the input signal 102 may represent, for example, a high-frequency band of the original audio signal and may quantize one or more parameters such as, for example, the data envelope spectrum data about noise and/or missing harmonic data with low resolution. The original audio signal can be, for example, a sound signal recorded by the microphone before processing or encoding.

Scaling of the input signal according to the first algorithm to create "patches" and according to the second algorithm create "patches" means, for example, that the input signal is scaled once according to the first algorithm for generating the patch before it is generated the first patch, and then the first patch is generated based on the scaled input signal and the input signal is scaled once according to the second algorithm of creating a "zapl the t" before what generated the second patch, and then the second patch is generated based on the scaled input signal, so that after combining the first patch, the second patch and the first band of the input signal with a wider bandwidth to satisfy the standard envelope of the spectrum. Alternatively, the first patch and the second patch are scaled after their generation so that a signal with a wider bandwidth also meets the criteria of the envelope of the spectrum. Also it is possible to scale the input signal according to the first algorithm to create "patches" and according to the second algorithm create "patches" along with the scaling of the first patch and the second patch.

A combiner 120 may be, for example, an adder, and a signal with a wider bandwidth 122 may be a weighted sum of the first patch 112, the second patch 114 and the first band of the input signal 102.

The satisfaction criterion envelope spectrum means, for example, that the envelope of the spectrum of a signal with a wider bandwidth is based on the envelope of the spectrum contained in the input signal. Data envelope spectrum can be generated by the encoding device and may provide the second band of the original signal. Thus, the envelope of the spectrum of a signal with a wider bandwidth can is be a good approximation of the spectrum envelope of the original signal.

The device 100 may also include a main decoder for decoding the first band of the input signal 102.

Generator patches 110 and a multiplexer 120 can be, for example, a specially designed hardware, or part of a processor or microcontroller, or can be a computer program generated to run on a computer or microcontroller. The device 100 may be part of a decoder or audio decoder.

Figa shows a block diagram of a device 300 for generating a signal with a wider bandwidth 122 from the input signal 102 according to the implementation of the invention. In this example, the generator patch 110 includes a phase vocoder 310 to generate the first patch and the amplitude limiter 320 in order to generate the second patch 114. The phase vocoder 310 and the amplitude limiter 320 is connected to the combiner 120. The phase vocoder 310 may extend the first band of the input audio signal 102 to generate the first patch 112, including harmonic frequencies. At the stage of non-linear processing of the amplitude limiter 320 may limit the input signal 102 to generate the second patch 114, including harmonic and non-harmonic frequencies. Alternative amplitude limiter 320 also poluvalmovye rectifier, wave rectifier, a mixer or a diode, use the e in a square region of the characteristic curve, can be used to generate non-harmonic frequencies based on an input signal 102, at the stage of non-linear processing.

Fig.3b, 3C and 3d show examples of signal level restriction and/or rectified input signal 102 to generate non-harmonic frequencies. Fig.3b shows a schematic illustration 350 sinusoidal input signal with a level restriction 102. When the limit signal appear break point in the form of abrupt changes in slope signal 380, and the generated harmonic and non-harmonic part with the higher frequencies.

Alternatively, pigs shows a schematic illustration 360 half-wave rectified sinusoidal input signal 102, also causing the break point 380.

Next, the possible combination of constraints and straightening. Fig.3d shows a schematic illustration 370 signal level restriction and wave rectified sinusoidal input signal 102, the calling different break point 380.

Limitation and/or straightening or other methods of non-linear processing produces a break point 380 may generate a wide range of different frequencies. So the patch generated according to the same algorithm to create "patches"may have a high spectral density.

Figure 4 shows the block diagram of the device is TBA 400 for generating a signal with a wider bandwidth 122 from the input signal 102 according to the implementation of the invention. Device 400 is similar to the device shown in figa, but additionally includes a selector spectral lines 410. The phase vocoder 310 and the amplitude limiter 320 is connected to the selector spectral lines 410 and the selector spectral line 410 is connected to the combiner 120. The selector spectral lines 410 may select a set of frequency lines of the second patch 114, to obtain a modified second patch 414, which may be additional to the first patch. Frequency line of the second patch 114 may be selected if there is no corresponding frequency line of the first patch 112. In other words, the selector spectral lines 410 selects the frequency lines of the second patch 114 to fill in the gaps of the first patch 112 and can ignore the frequency of the second patch 114, already contained in the first patch 112. Thus, the modified second patch 414 may include gaps in the frequencies contained in the first patch 112.

In this example, the combiner 120 combines the first patch 112, the modified second patch 414 and the first band of the input signal 102.

The selector spectral lines 410 may be, for example, a part of the generator patch 110 (as shown in figure 4) or a single node.

Further with reference to Figure 5 and 6 shows a possible implementation of the phase vocoder 310 according to this invention. Figa shows the t of the execution of the comb filters of the phase vocoder, where the audio signal is input 500 and output 510. In particular, each channel is a schematic diagram of the comb filter shown in figa includes a band-pass filter 501 and the subsequent oscillator 502. The output signals of all of the oscillators from each channel are combined by the combiner, which, for example, is performed as the adder and is denoted by numeral 503 to obtain the output signal. Each filter 501 is carried out in such a way that it provides a signal with an amplitude coding on the one hand and the signal with frequency encoding on the other hand. The signal amplitude coding and signal with frequency coding time signals, illustrating the increase of the amplitude in the filter 501 over time, while the signal with the frequency encoding is an increase in the frequency of the signal filtered by the filter 501.

A schematic device filter 501 is illustrated in fig.5b. Each filter 501 figa can be located on fig.5b, where, however, only the frequency f_isupplied to the two input mixers 551 and the adder 552 differ from channel to channel. Mixing the output signals of the mixers 551 both filtered by low pass filters 553, where the signals of lower frequencies are different, because they were generated by the frequency of the local oscillator (LO frequency), which are not the same what about the phase by 90°. Top lowpass filter 553 provides a quadrature signal 554, while the lower filter 553 provides the same phase signal 555. These two signals, that is, Q and I, are supplied to the coordinate Converter 556, which generates an amplitude-phase representation rectangular representation. The magnitude of the signal or the amplitude of the signal, respectively figa over time is displayed on the output 557. The phase signal is supplied to the device for deployment phase 558. The output element 558 is no longer any phase value, which is always between 0 and 360°, but has a phase value that increases linearly. This "expanded" phase is supplied to the phase/frequency Converter 559, which may, for example, be performed as a simple calculator to the phase difference, which subtracts the phase preceding the point in time of the phase at a given point in time, to obtain the frequency value for a given point in time, or any other means to obtain the approximation of the phase derivative. This frequency value is added to the constant frequency value f_ichannel filter i to obtain the time-varying frequency value at output 560. The frequency value at the output of 560 has a DC component equal to f_iand a variable component, RA is ing of frequency deviation, in which the frequency of the signal in the channel filter deviates from the average frequency f_i.

Thus, as illustrated in Figa and 5b, the phase vocoder reaches the separation between the spectral information and temporal information. The spectral information contained in a special channel or frequency f_ithat provides a direct part of the frequency for each channel, while the time information contained in the frequency deviation, or in the evolution of the magnitude over time, respectively.

Figs shows manipulation, as it is executed, to generate the first patch according to the invention, in particular through the use of the phase vocoder 310 and, in more detail, inserted where there are dotted lines illustrated diagrams on figa.

For scaling of time, for example, the amplitude signal A(t) in each channel or the frequency of signal f(t) in each channel can be reduced in 10 times or interpolated. In order to move as it is useful for the present invention, the interpolation, i.e. temporary extension or distribution of the signals A(t) and f(t)to obtain the signal distribution A'(t) and f(t), where interpolation is governed by the factor distribution 598. Factor distribution can be selected, for example, so that the phase vocoder gene who has demonstrated harmonic frequencies. By interpolation, phase changes, that is, the values before the addition of a constant frequency adder 552, the frequency of each individual oscillator 502 on figa does not change. The temporal variation of the full sound signal is slowed, however, by a factor of 2. The result is widespread in time tone, with an original principal tone, that is, the original main wave with its harmonics.

By performing signal processing, illustrated in figs, the audio signal may be reduced to its original length, for example, by a decimation factor of 2, while all frequencies simultaneously doubled. This moves the main tone factor 2, where, however, the result is an audio signal that has the same length as the original audio signal, i.e. the same number of samples.

Alternatively, the execution of the comb filters is illustrated in figa can also convert the phase vocoder, as shown in Fig.6. Here, the audio signal 698 fed into the FFT processor, or more broadly, in the processor of short-term Fourier transform (STFT) 600 as a sequence of time samples. The FFT processor 600 is to perform temporal processing an audio signal using a window ctabitem by the subsequent FFT to compute the magnitude spectrum and phase spectrum, where this calculation is performed for successive spectra, which are connected with the blocks of the audio signal, which strongly overlap.

In the extreme case, for each new sample of the audio signal can be calculated in the new range, where the new range can also be calculated, for example, only every twentieth of a new sample. This distance 'a' in samples between the two spectra is preferably performed by the controller 602. The controller 602 then proceeds to provide the processor IFFT (fast inverse Fourier transform) 604, which is to perform overlap - add. In particular, the IFFT processor 604 is performed in such a way that it performs the inverse short time Fourier transform through the implementation of a single IFFT on the range, based on the magnitude spectrum and phase spectrum, and then to perform an operation overlay - add to get the resulting time signal. The operation of the overlap - add is performed to eliminate the blocking effect, introduced by the analysis window.

Temporary signal propagation time is achieved by the distance 'b' between the two spectra, since they are processed by the IFFT processor 604, which is greater than the distance 'a' between the spectra used to generate the FFT spectra. The basic idea is ostoic is to distribute the audio signal by simply placing inverse FFT farther from each other than analyzing FFTs. In the spectral changes in the synthesized sound signal occur more slowly than in the original audio signal.

Without changing the phase of scale in block 606 this, however, will cause the frequency artifacts. When, for example, is considered a single element resolution frequency for which to run consecutive phase values at 45°, this implies that the signal within this comb filter is increased in phase with the speed of 1/8 of a cycle, that is, 45° by the time interval, where the time interval is a time interval between successive FFTs. If now the inverse FFTs are further away from each other, this means that 45° increase phase occurs on a longer time interval. This means that the frequency of this part of the signal was inadvertently changed. To eliminate this artifact, you change the scale of the phase by the same factor by which the audio signal is spread in time. The phase of each spectral value of the FFT, thus, increases by a factor of b/a to correct this inadvertent modification of frequency.

At that time, as in the implementation of proillyustrirovan the m figs, distribution by interpolation control signals amplitude/frequency was achieved for a single oscillator signals in the execution of the comb filters figa, the distribution of figure 6 is achieved by the distance between the two spectra IFFT, which is greater than the distance between the two spectra FFT, i.e. 'b' is greater than 'a', where, however, to prevent the artifact is scaled phase according to the ratio 'b/a'. The distance 'b' can be selected, for example, so that the phase vocoder generated harmonic frequency.

7 shows a block diagram of an apparatus 700 for generating a signal with a wider bandwidth 122 from the input signal 102 according to the implementation of the invention. The device 700 is similar to the device shown in figure 1, but includes the power controller 710, the first power control unit 720 and the second power control unit 730. The power controller 710 is connected to the first power control unit 720 and the second power control unit 730. The first power control unit 720 and the second power control unit 730 is connected to the generator patch 110. The power controller 710 may control the scaling of the input signal according to the first and second algorithm create a patch based on data bypass the it spectrum, contained in the input signal based on the control data scaling patches contained in the input signal. Alternatively, instead of the control data scaling patches contained in the input signal, can be used, at least one saved parameter control scaling patches. Control parameter scaling patches can be stored in memory control setting scaling patches, which may be part of the power controller 710 or a separate node. The first power control unit 720 can scale the input signal 102 according to the first algorithm to create "patches", and the second power control unit 730 can scale the input signal 102 according to the second algorithm create "patches". In other words, the input signal 102 may be pre-processed so that could be generated by the first and second patch so that a signal with a wider bandwidth to satisfy the standard envelope of the spectrum. Data envelope spectrum can determine the envelope of the spectrum of a signal with a wider bandwidth 122, and control data scaling patches or control parameter scaling patches can establish a relation between the first patch 112 and the second patch 114 or could the t to set the absolute value of the first patch 112 and/or the second patch 114. The first power control unit 720 and the second power control unit 730 may be part of the power controller 710 or individual nodes, as shown in Fig.7. The power controller 710 may be part of a generator patch 110 or a separate node, as also shown in Fig.7. The device power control 720, 730 may be, for example, amplifiers or filters, managed power controller 710.

Alternatively, the scaling is performed after generating the patches. Accordingly Fig shows a block diagram of an apparatus 800 for generating a signal with a wider bandwidth 122 from the input signal 102 according to the implementation of the invention. The device 800 is similar to the device shown in Fig.7, but the device power control 720, 730 are located between the generator patches 110 and coupler 120. In this example, the generator patch 110 is connected to the first power control unit 720 and is connected with the second power control unit 730. The first power control unit 720 and the second power control unit 730 is connected to the combiner 120. Thus, the first patch 112 may be scaled by the first power control unit 720 according to the first algorithm for generating the patch and the second patch 114 can be scaled second device is a means of regulating the power 730 according to the second algorithm create "patches". The device power control, managed power controller 710, again based on data envelope spectrum and the control data scaling patches or control setting scaling patches, as described above.

Alternatively, it is also possible scaling or power control only one of the two patches, followed by merging patches through the multiplexer 120, and scaling of the joint patches prior to the merger the merged patch with the first range of input signal 102. In other words, first one patch can be scaled to implement a predetermined ratio (for example, based on the control data scaling patches) between the two patches, and then merged patch scale (e.g., based on data from the envelope spectrum)in order to satisfy the criterion of the envelope of the spectrum.

Control data scaling patches may include, for example, a simple factor or set of parameters for the scaling of the power distribution. Control data scaling patches can specify, for example, the ratio between the first patch and the second patch to complete the second page or full high-frequency band or the absolute value of the capacity of the first patch and/or vtoro the patches to complete the second page or full high-frequency band, and can be represented by at least one parameter. Alternatively, data scaling patches include a factor for each set of sub-bands constituting the second band or frequency band, for example, such data envelope spectrum at sub-range when using replication spectral bandwidth. Alternatively, data scaling patches can also show the transfer function of the filter. For example, the parameters of the transfer function filter for scaling the first patch and/or parameters of the transfer function filter for scaling the second patch may be contained in the input signal. Thus, the parameters may represent a function of frequency. Another alternative may be the control parameters scaling patches representing the differential function of the first patches and the second patches. According to these examples, the scaling of the input signal or the scaling of the first patch and the second patch may be based on control data, scaling patches, including at least one parameter.

Fig.9 shows a block diagram of an apparatus 900 for generating a signal with a wider bandwidth 122 from the input signal 102 according to the implementation of the invention. The device 900 is similar to the device shown in Fig, what about the includes, additionally, the adder noise 910, the adder missing harmonics 920, the power control unit noise 940 and the power control unit of the missing harmonics 950. The adder noise 910 is connected to the power control unit noise 940, which is connected to the combiner 120. The adder missing harmonics 920 is connected to the power control unit of the missing harmonics 950, which is connected with the multiplexer 120. Further, the power controller 710 is connected to the power control unit noise 940 and the power control unit of the missing harmonics 950. The adder noise 910 may generate noise patch 912, based on sound data contained in the input signal 102.

Noise patch 912 may be scaled by a power control unit noise 940. The power controller 710 may control the power control unit noise 940, based on data from the envelope spectrum and/or data scaling of the noise contained in the input signal 102. Thus, the noise of the original signal can be approximated to improve the sound quality of a signal with a wider bandwidth.

The adder missing harmonics 920 may generate a patch of missing harmonics 922, based on the data of the missing harmonics contained in the input signal. Patch missing ha is Monique 922 may contain harmonic frequencies, which can only appear in the high frequency band of the original signal and therefore may not be reproduced, if the only available information is the low-frequency band of the original signal in the first band of the input signal 102. Data missing harmonics can provide information about these missing harmonics. Patch the missing harmonics 922 may be scaled by a power control unit of the missing harmonics 950. The power controller 710 may control the power control unit of the missing harmonics 950, based on data from the envelope of the spectrum or data-based scaling of the missing harmonics contained in the input signal 102.

A combiner 120 may combine the first patch 112, the second patch 114, the first band of the input signal 102, the noise patch 912 and a patch of missing harmonics 922 to receive a signal with a wider bandwidth 122. The power controller 710 in combination with a power control unit can scale the first patch 112, the second patch 114, noise patch 912 and a patch of missing harmonics 922, based on data from the envelope of the spectrum, so as to satisfy the criterion of the envelope of the spectrum.

Figure 10 shows a block diagram of an apparatus 1000 for receiving the signal with reduced bandwidth 1032, the basis of the data input signal 1002 according to the implementation of the invention. The device 1000 includes the identifier data of the envelope spectrum 1010, the generator control data scaling patches 1020 and the output interface 1030. The identifier data of the envelope spectrum 1010 and generator control data scaling patches 1020 is connected with the output interface 1030. The identifier data of the envelope spectrum 1010 may determine the data envelope spectrum 1012, based on the high-frequency band of the input signal 1002. The generator control data scaling patches 1020 may generate control data scaling patches 1022 to scale the signal with reduced bandwidth 1032 in the decoder or to scale the first patches and the second patches decoder so that a signal with a wider bandwidth, produced by the decoder meets the criteria of the envelope of the spectrum. The criterion of the envelope of the spectrum is based on the envelope of the spectrum. The first patch is generated from the first band signal with reduced bandwidth 1032 according to the first algorithm for generating the patch and the second patch is generated from the first band signal with reduced bandwidth 1032 according to the second algorithm create "patches". The spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral density is erway patches, generated according to the first algorithm to create "patches". Output interface 1030 combines the low frequency band of the input signal 1002, the data envelope spectrum 1012 and control data scaling patches 1022 to receive the signal with reduced bandwidth 1032. Further, the output interface 1030 provides a signal with reduced bandwidth 1032 for transmission or storage.

The device 1000 may also include a main encoder for encoding the low-frequency band of the input signal. Main encoder may be, for example, differential encoder, entropy encoder or perceptual audio encoder.

The device 1000 may be part of the coding device, which is formed to provide a signal to the decoder described above. Control data scaling patches 1022 may include, for example, a simple factor or set of parameters for the scaling of the power distribution. Control data scaling patches can show, for example, the ratio between the first patch and the second patch on the full high-frequency band or the absolute value of the capacity of the first patch and/or the second patch on the full high-frequency band and can be represented at m is re, one option. Alternatively, data scaling patches include the factor defined for each set of sub-bands constituting the high-frequency band, for example, such data envelope spectrum at sub-range when using replication spectral bandwidth. Alternatively, data scaling patches can also show the transfer function of the filter. For example, the parameters of the transfer function filter for scaling the first patch and/or parameters of the transfer function filter for scaling the second patch can be defined in order to generate control data scaling patches. Thus, the parameters may be generated based on a function of frequency. Another alternative may be generated by control parameters scaling patches representing the differential function of the first patch and the second patch.

Control data scaling patches 1022 can be generated by analyzing the input signal 1002 and selection of control parameters scaling patches stored in memory control setting scaling patches, based on the analysis of the input signal 1002 to receive control data scaling patches 1022.

Alternatively, the generation of control data the x scaling patches 1022 may be implemented by way of analysis by synthesis. For this purpose, the generator control data scaling patches 1020 can include, optionally, the generator patch (as described for the decoder and comparator. Generator patches may generate the first patch from the low-frequency band of the input signal 1002 according to the first algorithm for generating the patch and the second patch from the low-frequency band of the input signal 1002 according to the second algorithm create "patches". The spectral density of the second patch generated according to the second algorithm create "patches"may be higher than the spectral density of the first patch generated according to the first algorithm to create "patches". The comparator may compare the first patch, the second patch and the high-frequency band of the input signal to obtain the control data scaling patches 1022. In other words, the concept described above is also applicable to the device 1000. Thus, the device 1000 can extract control data scaling patches 1022 by comparing patches or merge patches from the input signal, which may, for example, be original sound signal. Additionally, the device 1000 can also include a selector spectral lines, power control, the adder noise and/or adder missing harmonics, as described above. Thus, the noise data is, control data scaling noise patches, missing harmonic data and/or control data scaling missing harmonic patches can be extracted by the method of analysis by synthesis.

Some of the implementation according to the invention relate to an audio signal that includes a first strip and second strip. The first line presents the data of the first resolution and the second strip presents data of the second resolution, where the second resolution lower than the first resolution. The data of the second resolution based on the data envelope spectrum of the second band and the control data, scaling patches of the second strip to scale the audio signal in the decoder or to scale the first patches and the second patches decoder, so that a signal with a wider bandwidth, produced by the decoder meets the criteria of the envelope of the spectrum. The criterion of the envelope of the spectrum is based on the envelope of the spectrum. The first patch is generated from the first band audio signal according to the first algorithm for generating the patch and the second patch is generated from the first band audio signal according to the second algorithm create "patches". The spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral energy density is of the first patch, generated according to the first algorithm for generating the patch.

The audio signal may be, for example, a signal with reduced bandwidth, based on the original audio signal. The first band audio signal may represent the low frequency band of the original audio signal, the encoded high resolution. Second band of the audio signal may represent the high frequency band of the original audio signal and may quantize at least two parameters: parameter envelope of the spectrum, as represented by the envelope of the spectrum, and control parameter scaling patches, presents control data scaling patches. Based on this audio signal decoder according to the concept described above can generate a signal with a wider bandwidth, providing a good approximation of the original audio signal with improved sound quality compared to known concepts.

11 shows a block diagram of a method 1100 for generating a signal with a wider bandwidth of the input signal according to the implementation of the invention. The input signal presented to the first band data of the first resolution and the second band data of the second resolution, the second resolution lower than the first allowed the E. The method 1100 includes generating 1110 of the first patch, generating 1120 of the second patch, scaling 1130 input or scaling 1130 of the first patches and the second patches and the Association 1140 first patch, the second patch and the first band of the input signal to obtain a signal with a wider bandwidth. The first patch 1110 is generated from the first band of the input signal according to the first algorithm to create "patches", and the second band is generated 1120 from the first band of the input signal according to the second algorithm create "patches". The spectral density of the second patch generated 1120 according to the second algorithm create "patches", higher than the spectral density of the first patch generated 1110 according to the first algorithm to create "patches". The input signal can be scaled 1130 according to the first algorithm to create "patches" and according to the second algorithm create "patches", or the first patch and the second patch can be scaled 1130 so that a signal with a wider bandwidth to satisfy the standard envelope of the spectrum.

Next, the method 1100 may be extended by the steps according to the concept described above. The method 1100 may be, for example, implemented as a computer program for running on a computer or microcontroller.

Fig shows a block diagram of a method 1200 is La grant signal with reduced bandwidth based on the input signal according to the implementation of the invention. The method 1200 includes determining 1210 data spectrum envelope based on high-frequency band of the input signal, generating 1220 management data scaling patches, Association 1230 low-frequency band of the input signal, the data envelope spectrum and the control data scaling patches to get a signal with reduced bandwidth, and ensuring 1240 signal with reduced bandwidth for transmission or storage. Control data scaling patches are generated 1220 to scale the signal with reduced bandwidth in the decoder or to scale the first patches and the second patches decoder so that a signal with a wider bandwidth generated by the decoder meets the criteria of the envelope of the spectrum. The criterion of the envelope of the spectrum is based on the envelope of the spectrum. The first patch is generated from the low-frequency band signal with reduced bandwidth according to the first algorithm for generating the patch and the second patch is generated from the low-frequency band signal with reduced bandwidth according to the second algorithm create "patches". The spectral density of the second patch generated according to the second algorithm create "patches",above, than the spectral density of the first patch generated according to the first algorithm for generating the patch.

Further, the method 1200 may be extended by the steps according to the concept described above. The method 1200 may be, for example, implemented as a computer program for running on a computer or microcontroller.

Some of the implementation according to the invention relate to devices for generating a signal with a wider bandwidth through the use of a phase vocoder for bandwidth expansion, combined with the nonlinear distortion or noise filling for more dense spectrum. When using the phase vocoder for the spectral distribution of the frequency lines are moved farther apart from each other. If in the spectrum in which there are gaps, for example, in the quantization, they even increase with the distribution. When adapting energy remaining lines in the spectrum get too much energy. This is prevented by filling gaps or noise, or further harmonics, which can be obtained by non-linear distortion of the signal. Thus, more energy can be distributed between the remaining lines. When the concentration of the energy in the bands are a limited number of frequency lines are unnatural or metallic sound. Energy is Oia previously existed more bands going on the remaining.

If in the spectrum there are no gaps, but at least there is some noise, some of the energy remains at a minimum level of noise. When applying harmonic distortion spectrum can be re-compacted, on the one hand, the noise produced by the distortion, on the other hand, further harmonic parts, controlled by appropriate choice of the part of the signal to be distorted.

A signal with a wider bandwidth can then be, for example, a weighted sum of the filtered distorted signal and the signal, which was generated using the phase vocoder. In other words, a signal with a wider bandwidth can be a weighted sum of the first patch, the second patch and the first band of the input signal.

Some of the implementation according to the invention relate to the concept, suitable for all audio applications where the full bandwidth is not available. For example, for transmission over radio audio content using digital radio services, Internet stream or other audio communication applications can be used are described concept.

In the description of this invention in terms of several implementations exist modifications, permutations, and equivalents that are within the scope of this invention. It should also be noted that there are many viola is rativnyh methods implementation methods and structures of this invention. Therefore, it is assumed that the applied following patent claims be interpreted as including all such modifications, permutations, and equivalents which are within the true nature and scope of this invention.

In particular, it is stated that depending on the conditions, the inventive scheme may also be implemented in software. The implementation may be on a digital storage medium, particularly a floppy disk or CD with electronically-readable control signals capable of cooperating with a programmable computer system so that the corresponding method was implemented. Typically, the invention also comprises a computer program product with a control program stored on a machine-readable carrier for performing the inventive method when the computer program product is executed on a computer. In other words, the invention may also be implemented as a computer program with a control program for performing the method when the computer program product is executed on a computer.

1. Device(100; 300; 400; 700; 800; 900) to generate a signal with a wider bandwidth (122) from the input signal (102), where the input signal presented to the first band data of the first resolution and the second band dannymasterson resolution; the second resolution lower than the first resolution; including generator patch (110)configured to generate the first patch (112) from the first band of the input signal (102) according to the first algorithm for generating the patch and the second patch (114) from the first band of the input signal (102) according to the second algorithm create "patches", where the spectral density of the second patch (114), generated according to the second algorithm create "patches", higher than the spectral density of the first patch (112)generated according to the first algorithm to create "patches"; and a combiner (120)configured to combine the first patch (112), the second patch (114) and the first band of the input signal (102)to obtain a signal with a wider bandwidth (122), where the device for generating a signal with a wider bandwidth is made with the ability to scale the input signal (102) according to the first algorithm to create "patches" and according to the second algorithm create "patches" or scaling the first patches (112) and the second patch (114) so that a signal with a wider bandwidth satisfies (122) criterion the envelope of the spectrum.

2. The device according to claim 1, where the first algorithm to create "patches" is a harmonic algorithm create "patches", and the generator patch (110) is configured to Generalova the ü first patch (112) so that only frequencies that are integral multiples of the frequencies of the first band of the input signal (102), contained in the first patch (112).

3. The device according to claim 1, where the second algorithm create "patches" is the mixing algorithm create "patches", and the generator patch (110) is configured to generate the second patch (114) so that the second patch (114) contain frequencies that are integral multiples of the frequencies of the first band of the input signal (102), and contain frequencies that are not integer multiples of the first frequency band of the input signal (102).

4. The device according to claim 1, where the repressed LF component of the first patches (112) is suppressed LF-component of the second patch (114), and where the repressed RF component of the first patches(112) is suppressed high-frequency component of the second patch (114).

5. The device according to claim 1, includes a phase vocoder (310)made with the possibility to generate the first patch (112) according to the first algorithm for generating the patch.

6. The device according to claim 1, includes an amplitude limiter (320)made with the possibility to generate a second patch (114) according to the second algorithm create "patches" by limiting the first band of the input signal (102).

7. The device according to claim 1, the selector includes spectral lines (410)made with the possibility to select a set of frequency lines of the second C the Board (114) to obtain a modified second patch (414), where the frequency line is selected, if the frequency line corresponding to the selected frequency line, not included in the first patch (112) as generated by the generator patch (110), where the coupler (120) is formed to combine the first patch (112), a modified second patch (414) and the first band of the input signal (102).

8. The device according to claim 1, includes a power controller (710)made with the possibility to control the scaling of the input signal (102) according to the first and second algorithm create "patches" or control the scaling of the first patches (112) and the second patch (114), where the power controller 710 controls the scaling, based on data from the envelope of the spectrum contained in the input signal (102), and based on at least one saved parameter control scaling patches or control data scaling patches contained in the input signal (102).

9. The device according to claim 8, includes a first power control unit (720), made with the ability to scale the input signal (102) according to the first algorithm to create "patches" or to scale the first patch (112), and includes a second power control unit (730), made with the ability to scale the input signal (102) according to the second algorithm create "patches" or to masstaburi is the substance of the second patch (114), where the power controller (710) is configured to control the first power control unit (720) and the second power control unit (730).

10. The device according to claim 8, includes an adder noise (910) and the adder missing harmonics (920)where the adder noise (910) configured to generate a noise patch (912)based on noise data contained in the input signal, where the adder missing harmonics (920) configured to generate the missing harmonic patch (922), based on data of the missing harmonics contained in the input signal (102), where the power control device (710) is configured to control the scaling of the noise patches (912) and the missing harmonic patches (922), based on data from the envelope of the spectrum, and where the coupler (120) is configured to combine the first patch (112), the second patch (114), the first band of the input signal (102), noise patch (912) and the missing harmonic patch (922), to obtain a signal with a wider bandwidth (122), where the power controller 710 controls the scaling of the first patches (112), the second patch (114), noise patches (912) and the missing harmonic patches (922), based on data from the envelope of the spectrum to be satisfied the criterion of the envelope of the spectrum.

11. Device (1000) for predostavlyaemye with reduced bandwidth (1032), based on the input signal (1002), including the identifier data of the envelope of the spectrum (1010)made with the possibility to define the data envelope spectrum (1012), based on high-frequency band of the input signal (1002); generator control data scaling patches (1020) is configured to generate control data scaling patches (1022) for the scaled signal with reduced bandwidth (1032) in the decoder or to scale the first patches and the second patches decoder so that a signal with a wider bandwidth generated by the decoder meets the criteria of the envelope of the spectrum, where the criterion of the envelope of the spectrum is based on the data envelope spectrum (1012), where the first patch is generated from the first band signal with reduced bandwidth (1032) according to the first algorithm for generating the patch and the second patch is generated from the first band signal with reduced bandwidth (1032) according to the second algorithm create "patches", where the spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral density of the first patch generated according to the first algorithm to create "patches"; output interface (1030) made with the possibility to combine the low frequency band of the input signal is (1002), data envelope spectrum (1012) and control data scaling patches (1022), to obtain a signal with reduced bandwidth (1032) and formed to provide a signal with reduced bandwidth (1032) for transmission or storage.

12. The device according to claim 11, where the generator control data scaling patch generator includes patches made with the possibility to generate the first patch from the low-frequency band of the input signal (1002) according to the first algorithm for generating the patch and generate a second patch from the low-frequency band of the input signal (1002) according to the second algorithm create "patches", where the spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral density of the first patch generated according to the first algorithms create "patches"; and a comparator configured to compare the first patch, the second patch and the high-frequency band of the input signal (1002) for receiving control data scaling patches (1022).

13. The device according to claim 11, comprising a memory control setting scaling patches made with the possibility to save and provide a number of control parameters scaling patches, where the generator control data scaling patches (1020) is executed with the option to analyze the input signal (1002) and to generate control data scaling patches (1022), based on the stored control parameters scaling patches selected based on the analysis of the input signal (1002).

14. The computer-readable storage medium with the stored sound signal, including the front page, presents the data of the first resolution; and a second band, presents data of the second resolution, where the second resolution lower than the first resolution, where the data of the second resolution based on the data envelope spectrum of the second band based on the control data, scaling patches of the second strip to scale the audio signal in the decoder or to scale the first patches and the second patches decoder so that a signal with a wider bandwidth generated by the decoder meets the criteria of the envelope of the spectrum, where the criterion of the envelope of the spectrum is based on the envelope of the spectrum, where the first patch is generated from the first band audio signal according to the first algorithm for generating the patch and the second patch is generated from the first band audio signal according to the second algorithm create "patches", where the spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral density of the first patch generated according to the first algorithm created what I "patches".

15. The method (1100) generating a signal with a wider bandwidth of the input signal where the input signal presented to the first band data of the first resolution, and for the second band data of the second resolution, the second resolution lower than the first resolution; includes generating (1110) the first patch from the first band of the input signal according to the first algorithm to create "patches"; generate (1120) the second patch from the first band of the input signal according to the second algorithm create "patches", where the spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral density the first patch generated according to the first algorithm to create "patches"; scale (1130) of the input signal according to the first algorithm to create "patches" and according to the second algorithm create "patches", or scaling (1130) the first patch and the second patch so that a signal with a wider bandwidth to satisfy the standard envelope of the spectrum; and Association (1140) the first patch, the second patch and the first band of the input signal to obtain a signal with a wider bandwidth.

16. Method (1200) providing a signal with reduced bandwidth, based on an input signal, including determining (1210) data envelope specification of the tra, based on the high-frequency band of the input signal; generating (1220) control data scaling patches for scaling signal with reduced bandwidth in the decoder or scaling the first patches and the second patches decoder so that a signal with a wider bandwidth generated by the decoder meets the criteria of the envelope of the spectrum, where the criterion of the envelope of the spectrum is based on the envelope of the spectrum, where the first patch is generated from the first band signal with reduced bandwidth according to the first algorithm for generating the patch and the second patch is generated from the first band signal with reduced bandwidth according to the second algorithm create "patches", where the spectral density of the second patch generated according to the second algorithm create "patches", higher than the spectral density of the first patch generated according to the first algorithm to create "patches"; merge (1230) the low-frequency band of the input signal, the data envelope spectrum and the control data scaling patches to get a signal with reduced bandwidth; providing (1240) signal with reduced bandwidth for transmission or storage.

17. The computer-readable storage medium with stored computer software is the first software code for performing the method according to item 15, when the computer program runs on a computer or microcontroller.

18. The computer-readable storage medium stored thereon a computer program with program code for performing the method according to item 16, when the computer program runs on a computer or microcontroller.