The compression and the extension data of the audio signal

 

(57) Abstract:

The invention relates to data compression data compression of the audio signal. The technical result is to simplify the means of compression and cost reduction. The device data compression contains an input terminal for receiving an audio signal, a single-bit analog-to-digital Converter for analog-to-digital conversion of the audio signal, producing a signal bit sequence, the lossless encoder for compressing the data signal bit sequence lossless providing signal bit sequence with the compressed data, and an output terminal for the signal bit sequence with the compressed data. Suggested recording device and the transmitter containing the device data compression, the device extension data for extending a data signal bit sequence with the compressed data submitted by the device, data compression, and also revealed the playback device and the receiver containing the device extension data. 13 C. and 17 C. p. F.-ly, 11 ill. , 1 table.

The invention relates to a device for the compression of data is the R, the recording device containing the device data compression, the recording medium having the audio signal with the compressed data recorded on a track of said recording media to the device extension data for extending the audio signal with the compressed data, to the way the expansion data to the receiver that contains the device extension data, and reproducing device containing the device data extensions.

Data compression of the audio signal is well known in the prior art. In this regard, reference is made to the patent application EP 402973 [1] . This document describes the coder sub-band in which the sound signal converted by the analog-digital way with a specific sampling rate, such as 44.1 kHz, and the resulting sample in the form of, for example, 24-bit words alarm beeps in paduasoy splitting filter. Paduasoy splitting filter splits the wideband digital audio signal into many relatively narrowband poddiapazona signals. Using a psychoacoustic model is allocated masked threshold, and in blocks of samples poddiapazona signals applied consistently quantization specific number of digits on Vyborg ucitelem data compression of the audio signal, subject to the transfer. Conducted data compression based on the "drop" of those components in the sound signal, which is not audible, and represents, therefore, a method of lossy compression. Data compression described in [1] , to some extent, is the preferred method of data compression, but requires a significant amount of logic elements or teams during the implementation, respectively, in hardware or software, thus this method is expensive. In addition, the subsequent expansion unit also requires a significant amount of logic elements or teams during the implementation, respectively, in hardware or software.

The invention is aimed at creating a more simple device data compression data compression of the audio signal, as well as simpler and less expensive respective device extension.

The device data compression in accordance with the invention contains:

the tool input for receiving the audio signal,

the conversion tool for the conversion of the audio signal, providing a single-bit signal bit sequence, this means PR is data compression on the signal bit sequence without significant losses providing signal bit sequence with the compressed data and

tool output for the signal bit sequence with the compressed data. More specifically, when the audio signal is an analog sound signal, a conversion tool is made in the form of means of analog-to-digital conversion for performing a single-bit analog-to-digital conversion of the analog audio signal, providing the above-mentioned signal bit sequence.

The invention is based on the following situation. The audio signal can be fed in analog or in digital form. When analog-to-digital conversion, in accordance with the invention, the analog audio signal from a single-bit analog-to-digital Converter (also called a Converter bit sequence or the Sigma-Delta modulator), the audio signal to be analog-to-digital conversion, is sampled with a frequency, which is usually a multiple of the frequency of 44.1 kHz or 48 kHz. The output signal of the one-bit analog-to-digital Converter is a binary signal, called signal bit sequence. When audible in 16 bits per sample such digital audio signal redundantly sampled with a frequency which again is a lot of discretetime frequency 44.1 kHz (or 48 kHz), resulting in a one-bit signal bit sequence. Converting the audio signal into a single-bit signal bit sequence has a number of advantages. Converting the bit sequence is a coding method with high quality with the ability to decode high quality or decoding of low quality with consequent advantage in a more simple decoding scheme. In this regard, reference is made to the publication "A digital decimating filter for analog-to-digital conversion of hi-fi audio signals" (thinning Digital filter for analog-to-digital conversion of audio signals hi-fi), author J. J. van der Kam, [2] and "A higher order topology for interpolative modulators for oversampling A/D converters" (the Topology of higher-order interpolating modulators for excess discretizing analog-to-digital converters), the authors Kirk C. H. et al. , [3] .

Single-bit d / a converters are used in CD players, for example, for the inverse transform of the audio signal bit sequence into an analog audio signal. However, the audio signal recorded on whom is In the prior art it is well known, that obtained from the single-bit analog-to-digital Converter signal bit sequence is, roughly speaking, a random signal which has a "noise-like" spectrum. These types of signals are difficult to compress data.

However, it has been unexpectedly found that when using the lossless encoder, such as the variable length encoder as encoder Huffman or arithmetic coder can be obtained a significant reduction in the data, despite the noisy nature of the signal bit sequence from a single-bit analog-to-digital Converter.

These and other aspects of the invention will become clear and will be explained hereinafter with reference to the implementation described in the following descriptions of the drawings, in which:

Fig. 1 shows the device of the compressed data;

Fig. 2A - frequency spectrum of the output signal one-bit analog-to-digital Converter, and Fig. 2B shows the frequency spectrum of the same output signal in a lower frequency range;

Fig. 3 - device compression of the data included in the recording device for recording a signal bit sequence with the compressed data on the recording media;

Fig. 4 - device JUA is transmitting data through the environment;

Fig. 5 - performing expansion unit data;

Fig. 6 - device extension data included in the playback device for playback of the signal bit sequence with the compressed data from the recording media;

Fig. 7 - device extension data included in the receiving device for receiving the signal bit sequence with the compressed data from the transmission medium;

Fig. 8 - follow up of the recording device is further provided with an encoder error correction and channel encoder;

Fig. 9 - subsequent execution of the playback device, further provided with a channel decoder and a block error correction;

Fig. 10 - performance device data compression, in which the encoder lossless made in the form of an arithmetic encoder;

Fig. 11 - run expansion unit data, in which the encoder lossless made in the form of an arithmetic decoder.

Fig. 1 shows the device data compression that contains the input terminal 1 for receiving an audio signal. In the present example, the audio signal is an analog audio signal. The input terminal 1 is connected to input 2 bit analog-to-digital Converter is connected to the input 8 of the block 10 data compression. The output 12 of the block 10 data compression is connected to the output terminal 14.

One-bit analog-to-digital Converter 4 is adapted to perform one-bit analog-to-digital conversion of the audio signal and provides the signal bit sequence, which is supplied to the output 6. For this purpose, analog-to-digital Converter 4 receives a sampling frequency equal to Nfsthrough the entrance 16. fsis the frequency equal to, for example, 32 kHz, 44.1 kHz and 48 kHz, and N is a large number, such as 64. The audio signal is sampled in an analog-to-digital Converter 4 on the sampling frequency, for example, 2,8224 MHz (6444,1 kHz). The signal bit sequence appearing at the output 6 analog-to-digital Converter, and is, therefore, the transmission rate of discharges 2,8224 MHz.

Block 10 data compression is made in the form of a lossless encoder. Coders lossless have the advantage that they can compress the audio signal in such a way that after the expansion data by the decoder without loss original sound signal can be recovered without significant losses. This means that after the compression-expansion there is almost no loss of information. Codebrowse technology. Examples of such variable length coders are coders Huffman, arithmetic coders and coders Lempel-Ziv. In this regard, reference is made to the publication "A method for the construction of minimum-redundancy codes" (Method of constructing codes with minimum redundancy), the author D. A. Huffman, [4] ; "An introduction to arithmetic codihg" (Introduction to arithmetic coding), the author G. G. Langdon, [5] and "A universal algorithm for sequential data compression" (Universal algorithm for sequential data compression), the authors J. Ziv et al. , [6] .

Unit 10 performs data compression operation of the data compression signal bit sequence without significant losses to obtain at its output 12 bit signal sequence with the compressed data, which is supplied to output terminal 14.

Fig. 2A shows the frequency spectrum of the signal bit sequence, available at the output 6 analog-to-digital Converter 4, for the input signal in the form of a sine wave with a frequency of 5 kHz, diskretisierung at sampling frequency 2,8224 MHz. The spectrum thus shows a frequency between 0 Hz and 1.4 MHz. Fig. 2B shows part of the spectrum shown in Fig. 2A, namely, the part between 0 Hz and 100 kHz so as to more clearly show a sine wave with a frequency of 5 kHz contained in the signal RA is obanno high-frequency which means that the data compression mentioned signal will result in the reduction of a significant amount of data.

In contrast, studies have clearly demonstrated what can be achieved with a significant reduction in data. In the table the results of data compression performed by the three coders lossless, are given for three different pieces of music.

Fig. 3 shows the implementation of the recording device containing the device data compression are shown in Fig. 1. The recording device further includes a recording unit 30 to the signal recording bit sequence with the compressed data on the track of the carrier 32 entries. In this example, the carrier 32 is a magnetic recording medium, thus recording unit 30 includes at least one magnetic head 34 for signal recording bit sequence of the compressed data on the medium 32 entries. However, the recording medium may be an optical recording medium such as a CD or digital video disc (CVP).

Fig. 4 shows the implementation of the transmitter to transmit the audio signal through the medium Prdcr containing the device data compression are shown IMI data medium Prdcr. The transmitting unit 40 may include an antenna 42.

Transmission through a medium, such as radio frequency communication line or a storage medium, usually requires coding with error correction and channel coding performed on the signal bit sequence with the compressed data you want to send. Fig. 8 shows such transactions signal processing, carried out on the signal bit sequence with the compressed data in the recording device according to Fig. 3. Therefore, the recording device according to Fig. 8 contains the encoder 80 error correction, are well known in the prior art, and channel encoder 82, well known in damage to equipment.

Fig. 5 shows the implementation of the expansion unit data. The device has an input terminal 50 for receiving a sound signal with the compressed data, which has the appearance of a signal bit sequence with the compressed data submitted by the device data compression according to Fig. 1. The input terminal 50 is connected to the input 52 of block 54 of the extension data, which has an output 56 connected to the input 58 of the one-bit digital to analogue Converter 60. The output 62 of the inverter 60 is connected to the output terminal 64.

Block 54 of the extension data is of fmana or arithmetic decoder. Obviously, the decoder in the device extension data in Fig. 5 should be inverse to the encoder used in the device data compression according to Fig. 1, for implementing the operations of encoding-decoding without significant losses. Block 54 data extensions extends the bit sequence of the compressed data, thereby to obtain a copy of the original bit sequence that is input to 58 digital-analog Converter 60. The Converter 60 converts the bit sequence into an analog audio signal which is fed to the terminal 64.

Fig. 6 shows the device extension data in Fig. 5, included in the playback device. The playback device further includes a reading unit 70 for reading the signal bit sequence with the compressed data to the tracks of the carrier 32 entries. In this example, the carrier 32 is a magnetic recording medium, so that the read unit 70 includes at least one magnetic head 72 for reading the signal bit sequence with the compressed data from the storage media 32 entries. However, the recording medium may be an optical recording medium such as a CD or timedummy environment PDSR, contains the device extension data shown in Fig. 5. The receiver further includes a receiving unit 75 for reception of a signal bit sequence with the compressed data from the transmission medium Prdcr. The receiving unit 75 may include an antenna 77.

As explained above, the transmission through a medium, such as radio frequency communication line or a storage medium, usually requires coding with error correction and channel coding performed on the signal bit sequence with the compressed data to be transmitted, thus the corresponding channel decoding and error correction can be performed at the reception. Fig. 9 shows the operation of the signal processing: channel decoding and error correction carried out on the received signal, adopted the reading means 70 for reproducing device according to Fig. 6. Therefore, the reproducing device according to Fig. 9 contains a channel decoder 90, well known in the prior art, and the block 92 bug fixes, also well known in the prior art, to obtain copies of the signal bit sequence with the compressed data.

Another device data compression are shown in Fig. 10. In the compression device Dadi entropy encoder, such as arithmetic encoder 154. Further, the signal bit sequence is input unit 152 predictive filter. The output unit 152 predictive filter connected to the input of block 156 to determine the probability. The arithmetic encoder 154 encodes the signal bit sequence in the bit signal sequence from the compressed data in response to the value p of probability, served on its input 192. Block 156 to determine the probability determines the probability value indicating the probability that the discharge signal bit sequence, filed on block 4 of the transducer has a predetermined logical value, such as "1". This probability value, denoted by p in Fig. 10, is fed to the arithmetic encoder 154 to permit compression of the data signal bit sequence in arithmetic encoder 154. The determining unit 156 determines that the probability value from the output signal of the predictive filter 152. The arithmetic encoder 154 may compress the signal bit sequence on a frame-by-frame basis.

The operation of the device according to Fig. 10 is as follows. Predictive filter 152 implements predictive filtering of the signal Gnal has many levels within the range, for example, from +3 to -3. Next, for each set of peginterferon in the range of values of the multibit output signal is determined by the probability that the corresponding bit in the bit signal sequence is, for example, the digit "1". This can be done by counting the number of "ones" and "zeros" that appear in the signal bit sequence within a certain period of time, when a multi-bit output signal falls within one of these ranges. Thus obtained probability for different values of a multi-bit output signal is subsequently serves as a signal p of probability, the arithmetic encoder 154. The signal bit sequence with the compressed data is served arithmetic encoder on the output line 158 to pass through the medium Prdcr or the recording media.

Fig. 11 shows a corresponding expansion unit data to decode the signal bit sequence with the compressed data received through the medium Prdcr. The processing unit of Fig. 11 contains entropy decoder 172, which receives the signal bit sequence with the compressed data through the input 174. In the July arithmetic decoding bit sequence with the compressed data under the influence of the signal probability p, the input 176 to generate copies of the original signal bit sequence, which is supplied to the output 178. A copy is sent to the input 58 of the block 60 inverse transform.

Next, there is the block 180 feed probability for the signal p of probability, the arithmetic decoder 172. The signal probability p can be obtained in different ways depending on how the signal probability was obtained in the encoder. One way is to receive the signal p the probability of adaptive path from the output signal of the predictive filter 181. In this execution, predictive filter 181 is equivalent to predicting the filter 152 in the encoder and the block 180 feed probability is equivalent to block 156 to determine the probability in the encoder of Fig. 10. Another way of signal p of probability is to use the additional information received through the medium PDSR, as will be explained below.

Additional information may be generated by the device according to Fig. 10 for transmission to the device 11. Such additional information may include the filter coefficients for the filter 152, which are determined on a frame-by-frame basis, and these coefficients are passed to the appropriate predskazyvaemye describe the transformation of the multi-bit output signal predictive filter 152 in the signal p of probability. Such parameters are also included in the additional information and is transmitted to the supply unit 180 and the filter 181 to allow the formation of a signal probability p in the device according to Fig. 11 based on the multibit output signal applied predictive filter 181.

Entropy coder used in the implementation of Fig. 10, is adapted to encode a signal bit sequence using the signal probability for signal bit sequence with the compressed data. One such entropy encoder is the arithmetic coder described above. Another type of entropy encoder is, for example, a well-known coder limited conditions. Entropy decoder used in the implementation of Fig. 11, adapted to decode the signal bit sequence with the compressed data using the signal probability for obtaining a copy of the signal bit sequence with the compressed data. One such entropy decoder is the arithmetic decoder described above. Another type of such an entropy decoder, for example, is well known to the decoder restricted States.

Although the invention opisyvalos is reteni. Thus, various modifications may become apparent to specialists without going beyond the scope of invention, as they claimed in the claims. When the audio signal is in digital form, for example, discretized at a frequency of 44.1 kHz, and the sampling can be expressed, for example, 16 bits conversion tool adapted for excess sample of the digital audio signal with a frequency of, for example, 6444,1 kHz, to obtain a single-bit signal bit sequence.

Further it should be noted that the invention also applies to execution, in which the signal bit sequence submitted by the Converter 4, is subjected to additional processing of the signal, expressed in the treated single-bit signal bit sequence, which is supplied to the encoder 10 without loss. Such additional signal processing may include combining the left and right components of a stereo signal into a single-bit as bit sequences processed in a single-bit signal bit sequence.

Further, the invention embraces each new sign or combination of signs.

JV is i-fi audio signals" (thinning Digital filter for analog-to-digital conversion of audio signals hi-fi) author J. J. van der Kam, Philips Techn. Rev. 42, No. 6/7, April 1986, pp. 230-238.

3. "A higher order topology for interpolative modulators for oversampling A/D converters" (the Topology of higher-order interpolating modulators for excessively discretizing analog-to-digital converters), the authors Kirk C. H. et al. in IEEE Trans. on Circuits abd Systems, Vol. 37, N 3, March 1990, pp. 309-318.

4. "A method for the construction of minimum-redundancy codes" (Method of constructing codes with minimum redundancy), the author D. A. Huffman, in Proc. of the IRE, Vol. 40 (10), September 1952.

5. "An introduction to arithmetic coding" (Introduction to arithmetic coding), the author G. G. Langdon, in IBM J. Res. Develop. Vol. 28(2), March 1984.

6. "A universal algorithm for sequential data compression" (Universal algorithm for sequential data compression), the authors J. Ziv et al. in IEEE Trans. on Inform. Theory, Vol. IT-23, 1977.

1. The device data compression data compression of the audio signal containing the input means for receiving a sound signal conversion tool to convert the audio signal, providing a single-bit signal bit sequence, and the conversion tool provides a means of Sigma-Delta modulation, characterized in that it further comprises means lossless encoding for compressing the data signal realnosti with the compressed data, and tool output for the signal bit sequence with the compressed data.

2. The device data compression under item 1, characterized in that the audio signal is an analog sound signal, and the conversion tool is made in the form of means of analog-to-digital conversion for performing a single-bit analog-to-digital conversion of the analog audio signal, providing the above-mentioned signal bit sequence.

3. The device data compression under item 1 or 2, characterized in that the means of lossless encoding contains the variable length encoder.

4. The device data compression on p. 3, characterized in that the variable length coder is a coder Huffman.

5. The device data compression on p. 3, characterized in that the variable length encoder is an arithmetic encoder.

6. Method of data compression for compressing the audio signal containing the following operations: reception of the sound signal, converting the audio signal to obtain a single-bit signal bit sequence, and the conversion operation includes the operation of the Sigma-Delta modulation, characterized in that the stage is what's losses for the signal bit sequence with the compressed data and the signaling bit sequence with the compressed data.

7. A transmitter for transmitting an audio signal through a transmitting medium containing the device data compression according to any one of paragraphs. 1-5 and the transmission medium for the signal bit sequence with the compressed data in the medium.

8. The transmitter under item 7, characterized in that it contains means of encoding with error correction and/or means of channel coding for coding error correction and/or channel coding signal bit sequence with the compressed data before signal bit sequence with the compressed data in the medium.

9. A recording device for recording an audio signal on the recording media containing the device data compression according to any one of paragraphs. 1-5 and a recorder for recording a signal bit sequence with the compressed data on a track of the recording media.

10. The recording device under item 9, characterized in that the recording medium is an optical or magnetic recording media.

11. The recording device under item 9, characterized in that it contains means of encoding with error correction and/or means of channel coding for coding error correction and/or ka is the second sequence with the compressed data on the recording media.

12. The recording medium with the signal bit sequence with the compressed data recorded on a track of said recording medium, and the signal bit sequence obtained by compressing the data bit signal bit sequence, the bit signal bit sequence obtained by performing the conversion of the audio signal, and the converting includes the operation of the Sigma-Delta modulation.

13. The device extension data for extending signal with the compressed data, providing copies of the original sound signal containing the input means for receiving a sound signal with the compressed data, which is available in the form of a signal bit sequence with the compressed data, means for decoding lossless to perform the expansion of the data signal bit sequence with the compressed data with virtually no loss, providing signal bit sequence, means digital to analogue conversion for performing digital to analog conversion of the signal bit sequence providing a copy of the original audio signal, and output medium for p is, what that means digital to analogue conversion contains a Sigma-Delta demodulator.

15. The device extension data under item 13 or 14, characterized in that the means of decoding lossless contains a variable length decoder.

16. The device extension data on p. 15, characterized in that the variable length decoder is a decoder Huffman.

17. The device extension data on p. 15, characterized in that the variable length decoder is the arithmetic decoder.

18. The method of extension data for extending the audio signal with the compressed data to obtain a copy of the original audio signal that contains the following operations: reception of the sound signal with the compressed data, which is available in the form of a signal bit sequence with the compressed data, the execution of the extension data signal bit sequence with the compressed data without significant loss of signal bit sequence, performing digital to analog conversion of the signal bit sequence to obtain a copy of the original audio signal and supply a copy of the original audio signal.

19. A receiver for receiving an audio signal via re the channel bit sequence with the compressed data from the transmission medium.

20. The receiver under item 19, characterized in that it contains means of channel decoding and/or means for correcting errors for channel decoding and/or error correction signal received from the transmission medium, to obtain the above-mentioned signal bit sequence with the compressed data.

21. Reproducing device for reproducing the audio signal from the recording media containing the device extension data according to any one of paragraphs. 13-17 tool for reading the read signal bit sequence with the compressed data to the tracks of the recording media.

22. Reproducing device according to p. 21, characterized in that it contains means of channel decoding and/or error correction for channel decoding and/or error correction signal read from the recording media to obtain the above-mentioned signal bit sequence with the compressed data.

23. The device data compression data compression of the audio signal containing the input means for receiving a sound signal conversion tool to convert the audio signal, providing a single-bit signal bit sequence is omnitele includes a tool lossless encoding for compressing the data signal bit sequence without significant losses providing signal bit sequence with the compressed data, and tool output for the signal bit sequence with the compressed data, and the said means of lossless encoding contains entropy encoder for entropy encoding the signal bit sequence in response to the signal probability of providing the above-mentioned signal bit sequence with the compressed data, a prediction tool for performance prediction signal bit sequence and a means of signal detection probabilities to determine the above-mentioned signal probabilities from the means of prediction.

24. The device data compression on p. 23, characterized in that the prediction tool includes a tool predictive filter to perform predictive filter on the signal bit sequence of operations for receiving a multi-bit output signal, and the said means of determining the probability adapted to receive the above-mentioned signal probability of the aforementioned multi-bit output signal.

25. Method of data compression for compressing the audio signal, stereomicroscope signal bit sequence, moreover, the conversion operation includes the operation of the Sigma-Delta modulation, characterized in that it further comprises the following operations: performing data compression without significant loss of signal bit sequence to obtain a signal bit sequence with the compressed data and the signaling bit sequence with the compressed data, and the above operation is lossless compression provides the following preoperative: entropy encoding signal bit sequence in response to the signal, the probability for obtaining the above-mentioned signal bit sequence with the compressed data, performing a prediction signal bit sequence and the definition of the above-mentioned signal probability of the prediction.

26. Method of data compression on p. 25, characterized in that the above-mentioned prediction contains the implementation of predictive filter on the signal bit sequence of operations for receiving a multi-bit output signal, and the above definition of probability contains a sub-operation of obtaining the above-mentioned signal probability of the aforementioned multi-bit output signal.

27. The device ID is an increase in the copies of the original sound signal, containing means input for receiving the audio signal with the compressed data, which is available in the form of a signal bit sequence with the compressed data, the tool lossless encoding to perform the expansion of the data signal bit sequence with the compressed data without significant losses, providing signal bit sequence, means digital to analogue conversion for performing digital to analog conversion of the signal bit sequence providing copies of the original sound signal, and the output medium for filing the copy of the original audio signal, and the said means of decoding lossless contains entropy decoder for entropy decoding of the bit signal sequence from the compressed data in response to the signal probability, providing the above-mentioned signal bit sequence, and means generate a signal probabilities for the filing of the above-mentioned signal probability.

28. The device extension data on p. 27, characterized in that the said entropy decoder is the arithmetic decoder.

29. The method of extension data for extending the data: receive an audio signal with the compressed data, which is in the form of a signal bit sequence with the compressed data, the execution of the extension data without significant loss of signal bit sequence with the compressed data to obtain a signal bit sequence, performing digital to analog conversion of the signal bit sequence to obtain a copy of the original audio signal and supply copies of the original sound signal, and said expansion operation without loss includes the following operations: entropy decoding signal bit sequence with the compressed data in response to the signal, the probability for obtaining the above-mentioned signal bit sequence and flow of the above-mentioned signal probability.

30. The way to expand the data on p. 29, characterized in that the said entropy decoding contains an arithmetic decoding.

Priority points:

10.10.1996 on PP. 1-7, 9-10, 12-19, 21.

11.07.1997 on PP. 8, 11, 20, 22-30.

 

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