Using spectral analysis, e.g. transform vocoders or subband vocoders (G10L19/02)

Device and method for processing sound signal using error signal due to spectrum aliasing // 2641253
FIELD: physics.SUBSTANCE: device for processing audio signal, containing a sequence of blocks of spectral values, includes a processor for calculating a signal under the influence of aliasing using at least one first modification to the first block of a sequence of blocks, and using at least one different second modification value for the second block of a sequence of blocks and for estimating the error signal due to aliasing, representing the error due to aliasing in the signal influenced by aliasing. The combination module combines the signal influenced by aliasing and the error signal due to aliasing.EFFECT: increasing the efficiency of audio signal processing.13 cl, 16 dwg

Device for coding audio signal having plurality of channels // 2640650
FIELD: physics.SUBSTANCE: device comprises a reception unit for receiving phase information, a transient process separating unit, a transient decorrelator, the second decorrelator, and a combiner unit, in which the transient process separating unit is adapted to divide the input signal into the first signal component and the second signal component such that the first signal component contains parts of the input signal transient process, and so that the second signal component contains signal parts without the input signal transient process. A decorrelator of the transition process is adapted to apply the phase information received by the reception unit to the transient process signal component.EFFECT: increasing the data transfer rate due to different processing of the transient process signal and the signal that does not contain the transient process.7 cl, 6 dwg

Device and method for decoding coded audio with filter for separating around transition frequency // 2640634
FIELD: physics.SUBSTANCE: device for decoding an encoded audio signal containing the encoded base signal, contains: a base decoder for decoding the coded reference signal to obtain the decoded primary signal; a module for generation of fragments for the formation of one or more spectral fragments having frequencies not included in the decoded reference signal, using the spectral part of the decoded reference signal; and a separation filter for the spectral filtration for separating the decoded reference signal and the first frequency of the fragment, with the frequencies going from the interval filling frequency of the signal absence to the upper boundary frequency, or for the spectral filtration for separating the first frequency part and the second frequency part.EFFECT: providing the possibility of encoding audio signals over a wide range of bit rates.15 cl, 35 dwg

Device and method for coding/decoding for expansion of high-frequency range // 2639694
FIELD: physics.SUBSTANCE: encoder can downsample the input signal, perform basic encoding of the input signal with reduced sampling, perform the frequency conversion of the input signal and perform the bandwidth extension encoding using the base signal of the input signal in the frequency domain.EFFECT: extending the high-frequency range by extracting the main signal of the input signal and adjusting the energy of the input signal using the tonality of the high-frequency range of the input signal and the key tone.7 cl, 38 dwg

Coder, decoder and methods for backward compatible dynamic adaptation of time/frequency authorization for spatial coding of audio objects // 2639658
FIELD: physics.SUBSTANCE: decoder for generating an output audio signal comprises one or more audio output channels, a downmix signal including a plurality of time domain downmix samples, a window sequence generator for determining a plurality of analysis windows, each of the analysis windows comprising a plurality of downmix samples of the time domain of the downmix signal. The decoder contains a module of t/f-analysis for converting the said plurality of samples of down-mixing the temporal region of each analysis window of the above-mentioned plurality of analysis windows from time domain in frequency-time domain depending on the window length of the said analysis window to obtain a transformed downmix. In addition, the decoder comprises an up-mixer.EFFECT: expanding the possibilities of multi-channel reproduction of individual audio content in order to improve the auditory sense.17 cl, 22 dwg

Transforming coding/decoding of harmonic sound signals // 2637994
FIELD: physics.SUBSTANCE: encoder for encoding coefficients (Y(k)) of frequency conversion of a harmonic audio signal includes the following elements: a location determinant for spectral peaks having values greater than a predetermined frequency dependent threshold. An encoder of the peak areas including and surrounding the detected peaks. A low-frequency coefficient set encoder is outside the peak areas and below the transition frequency, which depends on the number of bits used to encode the peak areas. A noise level enhancement encoder configured to encode a noise gain coefficient of, at least, one high frequency set of still unencoded coefficients outside the peak areas.EFFECT: improving the quality of the encoded harmonic sound signal.10 cl, 23 dwg
Prediction based on model in filter set with critical discreteization // 2636093
FIELD: physics.SUBSTANCE: signal of the first audio subband is determined using a set of analyzing filters comprising a series of analyzing filters that generate a series of subband signals from the audio signal, respectively, in a row of subbands. A method for estimating the first discrete signal value of the first subband signal in the first subband of an audio signal includes determining a model parameter for a signal model; determining a prediction coefficient to be applied to the previous discrete value of the decoded signals of the first subband obtained from the first subband signal based on the signal model based on the model parameter and based on the set of analyzing filters. The time interval of the previous discrete value precedes the time interval of the first discrete value; and determining the estimation of the first discrete value by applying the prediction coefficient to the previous discrete value.EFFECT: providing a low data rate with a low level of spurious frequencies.33 cl, 9 dwg

Device and method for coding or decoding sound signal with intelligent filling of intervals in spectral area // 2635890
FIELD: physics.SUBSTANCE: device for decoding the encoded audio signal comprises an audio decoder in the spectral domain to form the first decoded representation of the first set of the first spectral portions. The decoded representation has the first spectral resolution; a parametric decoder for generating the second decoded representation of the second set of the second spectral portions having the second spectral resolution lower than the first spectral resolution; a frequency re-forming unit for re-forming each composed second spectral portion having the first spectral resolution using the first spectral portion and the spectral envelope information for the second spectral portion; and a time-spectral converter for converting the first decoded representation and the reconstructed second spectral portion to the temporal representation.EFFECT: increasing the efficiency of encoding and decoding video data.26 cl, 41 dwg

Encoding and decoding positions of spectral peaks // 2635876
FIELD: physics.SUBSTANCE: audio signal segment encoding method comprises: determining, which of the two nondissipative coding circuits for spectral peak positions is used, wherein the first circuit is suitable for periodic or semi-periodic spectral peak position distributions, and the second circuit is suitable for sparse spectral peak position distributions; wherein the definition is based on the maximum distance dmax between two spectral peaks in the audio signal segment and the comparison of the number of bits required for the corresponding circuit after encoding the audio signal segment using two circuits; selecting the second coding circuit for spectral peak positions when the maximum distance dmax between two spectral peaks in the audio signal segment exceeds the threshold T; and selecting a spectral peak position encoding circuit that requires the least number of bits to encode the positions of the spectral peaks of the audio signal segment when the maximum distance dmax does not exceed the threshold T.EFFECT: increasing the efficiency of encoding/decoding spectral peaks.22 cl, 17 dwg, 1 tbl

Device and method for effective synthesis of synusoid and swip-synusoid by using spectral patterns // 2633136
FIELD: physics.SUBSTANCE: device for generating an output audio signal comprises a processing unit for processing a spectrum of the coded audio signal to obtain a spectrum of a decoded audio signal comprising a plurality of spectral coefficients, each of the spectral coefficients having a spectral arrangement in the spectrum of the coded sound signal and the spectral value. The spectral coefficients are sequentially ordered according to their spectral location in the spectrum of the coded sound signal so that the spectral coefficients form a sequence of spectral coefficients. In addition, the device comprises a replacement unit for replacing, at least, one or more pseudo-coefficients with a specific spectral pattern to produce an altered audio spectrum. The determined spectral pattern comprises, at least, two template coefficients, each of, at least, two of the pattern coefficients having a spectral value.EFFECT: increasing the efficiency of audio coding with low latency and low data rate.23 cl, 17 dwg, 4 tbl

ethods and devices for signal coding and decoding // 2633097
FIELD: physics.SUBSTANCE: it is determined, in accordance with the number of available bits and the predetermined first saturation threshold i, the number k of subbands to be encoded, where i is a positive number and k is a positive integer. In accordance with the quantized envelopes of all subbands, k subbands from all subbands are selected or k subbands from all subbands are selected in accordance with the psychoacoustic model. The first coding operation is performed on the spectral coefficients of k subbands. In embodiments of the present invention, the number of k subbands to be encoded is determined according to the number of available bits and the predetermined first saturation threshold, and the coding is performed on k subbands that are selected from all subbands and not over the full frequency range.EFFECT: improving the decoded signal quality.18 cl, 8 dwg

Device and method of selection of one of first coding algorithm and second coding algorithm by using harmonic reduction // 2632151
FIELD: physics.SUBSTANCE: device for selecting one of the first coding algorithm and the second coding algorithm to encode a portion of the audio signal to obtain an encoded version of a portion of the audio signal comprises a filter configured to receive an audio signal, reduce the amplitude of harmonics in the audio signal, and output a filtered version of the audio signal. The first evaluation module is provided to use the filtered version of the audio signal when estimating an SNR or segmental SNR portion of an audio signal as a first quality score for a portion of an audio signal that is associated with the first coding algorithm without actually encoding and decoding a portion of the audio signal using the first coding algorithm. The second evaluation module is provided for estimating the SNR or segment SNR as the second quality score for the portion of the audio signal that is associated with the second encoding algorithm.EFFECT: reducing the complexity of the choice between the first coding algorithm and the second coding algorithm.15 cl, 5 dwg

Noise filling in audio coding with perception transformation // 2631988
FIELD: physics.SUBSTANCE: audio decoder with perceptual transformation comprises: a noise filling module, a noise generating module of frequency area, wherein the noise generating module of frequency area is configured to: determine the spectral perceptual weighting function from the information of linear prediction coefficients, signaled in the data stream, in which the spectrum is encoded, or to determine the perceptual spectral weighting function of the scaling coefficients relating to the range of the scaling coefficients signaled in the data stream, in which the spectrum is encoded. The noise filling module is configured to: generate an intermediate noise signal; to identify continuous spectral zero parts of the audio signal spectrum; to determine the function for each continuous spectral zero part depending on the width of the corresponding continuous spectral zero part, the spectral position of the corresponding continuous spectral zero part; and to generate an intermediate noise signal.EFFECT: improving the audio quality after the spectrum is filled with noise.26 cl, 23 dwg

Audiodecoding device, device for audio coding, audiodecode method, audio coding method, audiodecoding program and audio code program // 2631155
FIELD: physics.SUBSTANCE: audio decoding device decodes the encoded audio signal and outputs the audio signal. The decoding unit decodes the encoded sequence containing the encoded audio signal and obtains the decoded signal. The selective shaping unit of the temporal envelope forms a temporal envelope of the decoded signal in the frequency band based on decoding related information regarding the decoding of the encoded sequence.EFFECT: reducing the distortion of a component of the frequency range encoded with a small number of bits in the time domain.16 cl, 24 dwg
Sound coding device and decoding device // 2630887
FIELD: physics.SUBSTANCE: speech encoder contains a framing module configured to receive a set of blocks; wherein mentioned set of blocks comprises a number of consecutive blocks of MDCT transformation coefficients; wherein mentioned set of blocks serves as a sign of discrete values of the speech signal. The transform coefficient block contains a number of transform coefficients for the corresponding series of frequency resolution elements. In addition, the encoder comprises an envelope estimation module configured to determine the current envelope based on a series of successive blocks of transform coefficients. This current envelope serves as a sign of a number of spectral energy values for a corresponding series of frequency resolution elements. In addition, the encoder comprises an envelope interpolation module configured to determine a number of interpolated envelopes based on a series of successive blocks of transform coefficients, respectively, based on the current envelope.EFFECT: improving the quality of encoding by providing a smooth transition between time-domain coding and frequency-domain coding.20 cl, 10 dwg

Device and method of decoding and media of recording the program // 2630384
FIELD: physics.SUBSTANCE: bandpass filter splits an input signal into a multitude of signals subranges. Characteristic quantity calculation scheme calculates the characteristic value using at least one of many received by dividing signals subranges and input signal. Scoreboard of high frequency power subbands calculates a value cardinality estimation subrange the higher frequencies on the basis of computed intrinsic value. The high-frequency signal generation circuit generates a high-frequency signal component based on a plurality of subband signals allocated by the bandpass filter and a high-frequency subband power estimate value computed by the high-frequency subband power estimate circuit. Expansion unit of frequency range extends the frequency range of the input signal using a high-frequency signal component, developed elaborate scheme of the high-frequency signal.EFFECT: increasing the sound quality of the audio signal by extending the frequency range.8 cl, 34 dwg

Decoder of speech, coder of speech, method of decoding the speech, method of coding the speech, program of decoding the speech and program of coding the speech // 2630379
FIELD: physics.SUBSTANCE: speech decoder includes a demultiplexing unit, a low-pass band decoding unit, a frequency band filter bank unit, an encoded sequence analysis unit, an encoded sequence decoding/dequantization unit, a high-frequency band generating unit, calculating time envelopes of the high frequency band using time envelope information and a plurality of temporal envelopes of the low frequency band, a temporal envelope correction unit that corrects the temporal envelope of the high frequency portion of the low frequency band, which computes the time envelope of the low frequency band, bands using temporal envelopes obtained by the temporal envelope calculation unit and a ban unit frequency filter synthesis filters.EFFECT: decrease in the leading and lagging echo.6 cl, 40 dwg

Decoder and method of parametric generalized concept of the spatial coding of digital audio objects for multi-channel mixing decreasing cases/step-up mixing // 2628195
FIELD: physics.SUBSTANCE: decoder to generate audio output contains one or more audio output from mixing with decreasing signal containing one or more channels of decreasing-mixing. Mixing with decreasing signal encodes one or more signals of digital audio objects. Decoder contains the determinant of a threshold to determine the threshold depending on the power signal and/or energy noise, at least one of the one or more signals of digital audio objects and/or depending on the power signal and/or energy noise, at least one of the one or more channels of decreasing-mixing. Moreover, the decoder contains a processing unit for generating of referred one or more output audio channels mentioned one or more channels of mixing ground depending on the threshold.EFFECT: improving the quality of encoding audio objects.14 cl, 4 dwg

Device and method for generating coded signal or decoding encoded audio signal by using site with multiple overlap // 2626666
FIELD: physics.SUBSTANCE: device for generating an encoded signal comprises: a controller of the window sequence for generating information about the window sequence for framing an audio signal, wherein the information about the window sequence indicates the first window function for generating the first frame of the spectral values, a preprocessor for framing the second block of samples corresponding to the second window function and one or more third window functions, a spectrum converter for receiving the first and the second frames of the spectral values and for receiving the first and the second portions of the spectral values of the second frame, a processor for processing the first frame and the second frame to obtain encoded frames of an audio signal.EFFECT: providing an improved concept of audio encoding, decoding, which provides an improved efficiency of the device.41 cl, 44 dwg

Coder, decoder and methods of scale transformation dependent on signal in spatial audio object coding // 2625939
FIELD: physics.SUBSTANCE: decoder for generating an output audio signal comprising one or more audio output channels from the downmix signal. The decoder comprises the first analysis module for converting the downmix signal to obtain the first converted downmix containing a plurality of channels of the first sub-range. The decoder comprises the second analysis module for generating the second transformed downmix by converting, at least, one of the channels of the first sub-range, to obtain a plurality of channels of the second sub-range, wherein the second transformed downmix includes the first sub-range channels, that were not converted by the second analysis module, and the channels of the second sub-range. The decoder comprises an upmix configured to upmix the second transformed downmix based on the parametric additional information on the said one or more audio object signals, to obtain an output audio signal.EFFECT: improving the encoded audio signal quality.16 cl, 22 dwg

Principle for coding mode switch compensation // 2625561
FIELD: information technology.SUBSTANCE: in response to a switch event, a temporary smoothing and/or mixing is implemented at transition between the first temporary portion of information signal before a switch event and the second temporary portion of information signal after a switch event in high-frequency spectrum band. Response is given to switching of one or more of: an audio encoding mode in the full bandwidth to a BWE audio coding mode, and a BWE audio coding mode to an audio encoding mode in the full bandwidth, wherein the high frequency spectrum band overlaps a portion of BWE-extension spectrum of a BWE audio encoding mode and a portion of spectrum of transformation or linear prediction encoding with a portion of audio encoding mode spectrum in the full bandwidth.EFFECT: increased audio quality when switching between different encoding modes with different bandwidths by smoothing and/or mixing sound at appropriate transition.16 cl, 21 dwg

Device and method for encoding or decoding audio signal with overlap depending on transition location // 2625560
FIELD: physics.SUBSTANCE: device comprises: a controlled framing module for framing an audio signal to provide a sequence of the sample framed blocks; a converter for converting the sequence of the sample framed blocks into the spectral representation comprising a sequence of the spectral value frames; a transition location detector to identify the transition location in the anticipation transferring area in the frame; and a controller to control the controlled framing module, to apply a particular window having a predetermined overlapping length, to the audio signal in response to the identified transition location, where the controller is configured to select the particular window of the group of, at least, three windows, including the first window having the first overlapping length, the second window having the second overlapping length, and the third window having the third overlapping or non-overlapping length.EFFECT: providing an improved audio encoding, decoding, providing the increase of the device performance.35 cl, 44 dwg

Audio encoder and decoder for encoding on interleaved waveform // 2622872
FIELD: physics.SUBSTANCE: these methods and devices for encoding and decoding audio signals, in particular, the method for endecoding includes receiving the encoded signal on the waveform, having a spectral content corresponding to the subset of the frequency range above the transition frequency. The encoded signal on the waveform is interleaved with the parametric high frequency audio signal reconstruction above the transition frequency, thereby an improved reconstruction of the audio signal high-frequency bands is achieved.EFFECT: providing an improved reconstruction of the transient processes and the tonal components in the high-frequency bands.25 cl, 9 dwg

Effective pre-echo attenuation in digital audio signal // 2622863
FIELD: radio engineering, communication.SUBSTANCE: method comprises: decoded signal decomposition to at least two subsignals according to a predetermined decomposition criterion; calculating attenuation coefficients relating to a sub-signal and a discrete value from a predetermined pre-echo zone; pre-echo attenuation in the pre-echo zone of each sub-signal by applying attenuation coefficients to these sub-signals; receiving the signal subjected to attenuation by combining the sub-signals subjected to attenuation.EFFECT: reduction of pre-echo irritating effect.15 cl, 13 dwg

Signal processor, window provider, encoded media signal, method for processing signal and method for providing window // 2616863
FIELD: information technology.SUBSTANCE: invention relates to data transmission and is intended for processing an input signal with window weight coefficients. Signal processor to provide a processed version of an input signal depending on input signal, includes a windower configured to window a portion of input signal, or of a pre-processed version thereof, in dependence on a signal processing window described by signal processing window values for a plurality of window value index values, in order to obtain processed version of input signal. Signal processor also comprises a window provider for providing signal processing window values for a plurality of window value index values in dependence on one or more window shape parameters.EFFECT: high efficiency of encoding by adaptation of window characteristics to characteristics of input spectrum of signal.35 cl, 17 dwg

Audiodecoder for decoding bit audio performance, audiocoder for encoding sound signal and method of decoding frame of encoded sound signal // 2616774
FIELD: physics.SUBSTANCE: method for decoding a frame of the encoded audio signal, wherein the encoded audio signal is generated by the audio encoder, the method comprises: extracting the first parameter from the encoded audio signal, wherein the first parameter represents the encoding mode for the frame; extracting the second parameter from the encoded audio signal; starting either the first decoding mode or the second decoding mode based on the first parameter value; generating a preliminary audio signal from the encoded audio signal when operating in either the first decoding mode or in the second decoding mode; and filtering the preliminary audio signal with a pitch filter. Thus when filtering, the second parameter is used for selective connecting or disconnecting the pitch filter, and the second parameter is different from the said first parameter.EFFECT: attenuating the interharmonic noise.20 cl, 11 dwg
Decorrelation of signals in audio data processing system // 2614381
FIELD: data processing.SUBSTANCE: invention relates to signal processing. Method of processing audio data includes receiving from a bit stream audio data, corresponding to a row of audio channels, application of decorrelation process to some of audio data, wherein decorrelation process involves using a decorrelation algorithm, active completely on real-valued coefficients.EFFECT: reduced complexity of coding and decoding algorithms owing to decorrelation of only real-valued coefficients.16 cl, 37 dwg

Data encoding method, data decoding method, encoder, decoder and codec // 2613031
FIELD: physics, computer engineering.SUBSTANCE: invention relates to encoding and decoding means. Correspondence of one or more portions of source data with one or more elements within one or more database is set up said one or more elements represent a respective one or more data block, and reference values which connect said one or more portions of input data with said one or more respective element is recorded. Reference values are included in the encoded data together with said one or more databases and/or information identifying said one or more databases. Encoded data including reference values and informaion on area identifiers, and information on one or more database is received. Reference values are decoded from the encoded data. One or more element from said one or more databases is extracted according to said reference values, wherein one or more said elements represents one or more corresponding data block. One or more said data block is formed for collection of corresponding outputting decoded data.EFFECT: invention improves the efficiency of data encoding/decoding.30 cl, 5 tbl, 3 dwg

Frequency emphasizing for lpc-based encoding in frequency domain // 2612589
FIELD: information technology.SUBSTANCE: invention relates to encoding and decoding audio signals. Audio encoder comprises a combination of a linear predictive coding filter having multiple linear predictive coding coefficients (LC) and a converter from the time domain into the frequency domain, herewith the said combination is configured with the ability of filtration and conversion of frame (FI) of audio signal (AS) into the frequency domain in order to output spectrum (SP) basing on the said frame (FI) and linear predictive coding coefficients (LC); a low-frequency emphasizing unit configured able to calculate processed spectrum (PS) basing on spectrum (SP), herewith spectral lines (SL) of processed spectrum (PS) representing a lower frequency than reference spectral line (RSL) are emphasized; and a control device made able to control the calculation of processed spectrum (PS) by means of the low-frequency emphasizing unit depending upon linear predictive coding coefficients (LC) of the linear predictive coding filter.EFFECT: technical result is ensuring the minimum of audible artefacts of encoding in the output audio signal at low frequencies by low-frequency emphasizing at the encoder side and deemphasizing at the decoder side.28 cl, 10 dwg

Control over phase coherency for harmonic signals in perceptual audio codecs // 2612584
FIELD: acoustics.SUBSTANCE: invention relates to means for control over phase coherency for harmonic signals in perceptual audio codecs. Decoder comprises a decoding unit and a phase adjustment unit. Decoding unit is adapted for decoding an encoded audio signal to obtain a decoded audio signal. Phase adjustment unit is adapted for adjustment of the decoded audio signal to obtain an adjusted in phase audio signal. Phase adjustment unit is configured able to receive control information depending on the vertical phase coherence of the encoded audio signal. Besides, the phase adjustment unit is adapted for adjustment of the decoded audio signal basing on control information.EFFECT: technical result is improvement the audio signal quality.18 cl, 9 dwg

Signal processor, window provider, coded media signal, signal processing method and method of forming windows // 2611986
FIELD: information technology.SUBSTANCE: invention relates to signal encoding and is intended for processing a signal with window weight coefficients. Signal processor for providing a processed version of an input signal depending on input signal comprises a windower, configured to window a portion of input signal, or of a pre-processed version thereof, in dependence on a signal processing window, described by signal processing window values for a plurality of window value index values, in order to obtain processed version of input signal. Signal processor also comprises a window provider for providing signal processing window values for a plurality of window value index values in dependence on one or more window shape parameters.EFFECT: technical result is high efficiency of encoding by adaptation of window characteristics to characteristics of input spectrum.6 cl, 16 dwg

Transform encoding/decoding of harmonic audio signals // 2611017
FIELD: information technology.SUBSTANCE: invention relates to means of encoding and decoding of harmonic audio signals. Encoder for encoding frequency transform coefficients of a harmonic audio signal includes following elements: a peak locator, configured to locate spectral peaks having magnitudes exceeding a predetermined frequency dependent threshold. Peak region encoder configured to encode peak regions including and surrounding located peaks. Low-frequency set encoder configured to encode at least one low-frequency set of coefficients outside the peak regions and below a crossover frequency that depends on ] number of bits used to encode peak regions. Noise-floor gain encoder, configured to encode a noise-floor gain of at least one high-frequency set of not yet encoded coefficients outside peak regions.EFFECT: technical result consists in improvement of quality of encoded harmonic audio signal.20 cl, 23 dwg, 1 tbl

Calculation of converter signal-noise ratio with reduced complexity // 2610588
FIELD: sound.SUBSTANCE: present invention relates to sound encoding and decoding facilities. Audio encoder includes conversion module, configured to determine set of spectral ratios based on said audio signal frame. Besides, encoder comprises encoding module with floating point, made with possibility to determine set of scaling factors and set of scaled values based on said set of spectral ratios; and encoding said set of scaling factors to obtain encoded set scaling factors. In addition, encoder comprises bits distribution and quantization module, configured to determine total number of available bits for set of scaled values quantization based on data transfer first target rate and based on number of bits used for set of coded scaling factors; determination of first control parameter, which serves as sign of total number of available bits distribution for quantization of scaled values from set of scaled values; and for set of scaled values quantization.EFFECT: technical result consists in reduction of computational complexity of bits distribution process used in audio encoding/decoding.32 cl, 12 dwg

Harmonic audio frequency band expansion // 2610293
FIELD: physics.SUBSTANCE: plurality of the gain values associated with the frequency band b and the plurality of the adjacent frequency bands for band b are received. It is determined whether the reconstructed corresponding frequency band b' contains a spectral peak. When band b' contains a spectral peak, the gain value associated with band b' is set as the first value based on the received plurality of the gain values; and otherwise, the gain value is set as the second value based on the received plurality of the gain values.EFFECT: improving quality of the harmonic audio frequency band expansion.12 cl, 10 dwg

Audio signal decoder, audio signal encoder, method of decoding audio signal, method of encoding audio signal and computer program using pitch-dependent adaptation of coding context // 2607264
FIELD: acoustics.SUBSTANCE: invention relates to means of encoding and decoding an audio signal. Audio signal decoder comprises a context-based spectral value decoder configured to decode a codeword, describing one or more spectral values or at least a portion of a number representation of one or more spectral values in dependence on a context state, to obtain decoded spectral values. Audio signal decoder also includes a context state determinator configured to determine a current context state in dependence on one or more previously decoded spectral values. Audio signal decoder also includes a time warping frequency-domain-to-time-domain converter configured to provide a time-warped time-domain representation of a given audio frame on basis of a set of decoded spectral values, associated with given audio frame and provided by context-based spectral value decoder.EFFECT: technical result is improvement of efficiency of encoding in presence of oscillations of fundamental frequency.18 cl, 51 dwg
Adaptation of weighing analysis or synthesis windows for encoding or decoding by conversion // 2607230
FIELD: acoustics; information technology.SUBSTANCE: invention relates to processing an audio signal and/or a video signal in the form of a sequence of samples and is intended for encoding and decoding a digital audio signal. For this purpose encoding or decoding is carried out by converting the digital audio signal using weighing analysis windows (ha) or synthesis windows (hs) used for samples frames, herewith the method includes non-uniform sampling (E10) of the initial window provided for a transformant of preset initial size N in order to use secondary conversion size M, which is different from N. Device includes a sampling module configured able to perform non-uniform sampling of the initial window provided for the transformant of given initial size N in order to use secondary conversion size M, which is different from N.EFFECT: saving memory resources and computational resources when encoding and decoding digital an audio signal by converting using weighing analysis and synthesis windows.15 cl, 7 dwg, 3 tbl

Delay-optimised overlap transform, coding/decoding weighting windows // 2604994
FIELD: information technology.SUBSTANCE: invention relates to coding/decoding of a digital signal, consisting of successive blocks of samples. Coding includes application of a weighting window to two blocks of M successive samples. In particular, this weighting window is asymmetric and comprises four distinct portions extending successively over two aforesaid blocks, with a first portion, increasing over a first interval, a second portion, constant at a weighting value over a second interval, a third portion, decreasing over a third interval, and a fourth portion, constant at a weighting value over a fourth interval.EFFECT: technical result is improved quality of encoded sound.17 cl, 10 dwg

Signal processing device, method and program // 2604338
FIELD: communication.SUBSTANCE: invention relates to signal processing device. Envelope information generation module can generate information on envelope that represents enveloping form of high-frequency components of audio signal intended for encoding. Sine-wave information generating module can select sine wave signal from high-frequency components of audio signal and generate information on sine wave, which represents position of appearing sine wave signal. Encoding flow generation module can multiplex information on envelope, information on sine wave, and low-frequency components of audio signal, which were encoded, and outputs encoded stream, obtained in result. As result, high-frequency components included in sine wave signal, can be predicted with higher accuracy from information on envelope and information on sine wave at side of receiving encoded stream.EFFECT: technical result is possibility of obtaining sound of higher quality when decoding audio signal.14 cl, 25 dwg

ethods and systems for efficient recovery of high frequency audio content // 2601188
FIELD: information technology.SUBSTANCE: invention relates to encoding, decoding and processing an audio signal, in particular, it relates to means of recovering high-frequency content of an audio signal from low-frequency content of same audio signal. Method comprises determining a first banded tonality value for a first frequency subband. First banded tonality value is used for approximating a high frequency component of audio signal based on a low frequency component of audio signal. Determining a set of transform coefficients in a corresponding set of frequency bins based on a block of samples of audio signal. Determining a set of bin tonality values for set of frequency bins using set of transform coefficients, respectively. Forming a first subset of two or more of set of bin tonality values for two or more corresponding adjacent frequency bins of set of frequency bins lying within first frequency subband, thereby yielding first banded tonality value for first frequency subband.EFFECT: technical result is reducing complexity of calculations in audio encoding based on systems with spectral expansion.29 cl, 15 dwg, 2 tbl

Speech decoder, speech encoder, speech decoding method, speech encoding method, speech decoding program and speech encoding program // 2599966
FIELD: information technology.SUBSTANCE: invention relates to speech decoder and encoder speech. Speech decoder includes a multiplexing unit, a unit for decoding the low-frequency band, a block of filter bank for frequency band separation, an encoded sequence, a decoding unit and de-quantiser encoded sequence, a unit for generating high-frequency band, a unit for calculating the time envelope of the low-frequency band, a unit for correction of time bending components of high-frequency band.EFFECT: technical result-reduction of distortion of the reproduced signal.19 cl, 40 dwg

Audio signal encoder, audio signal decoder, method for encoded representation of audio content, method for decoded representation of audio and computer program for applications with small delay // 2596594
FIELD: computer engineering.SUBSTANCE: invention relates to computer engineering. Audio signal encoder comprises a transform-domain path configured to obtain a set of spectral coefficients and noise-shaping information on the basis of a time-domain representation of a portion of the audio content to be encoded in a transform-domain mode. Transform-domain path comprises a time-domain-to-frequency-domain converter which performs window weighing in time domain of audio representation and outputs a set of spectral coefficients using time-domain-to-frequency-domain conversion window-weighted time representation of audio. Audio signal encoder includes a code-excited linear-prediction-domain path (CELP), which extracts information on code excitation and parameters of field of linear prediction of fragment audio encoded in CELP mode. Audio signal encoder allows selective formation of anti-aliasing information, when current fragment of audio follows fragment of audio coded by a CELP mode.EFFECT: technical result consists in improvement of efficiency of encoding successive fragments of audio.28 cl, 32 dwg

Audio system and method therefor // 2595912
FIELD: data processing; acoustics.SUBSTANCE: invention relates to audio systems. Audio system comprises a receiver which receives the input audio signal. Decomposition unit decomposes the audio signal into the transient component signal and the nontransient component signal. Then the output circuit generates the first output audio signal in response to balanced integration of the transient component signal and the nontransient component signal. Within the integration transient component signal balancing differs from nontransient component signal balancing. A new signal can be obtained with another emphasizing of the sound specific characteristics. Approach can be used to form new spatial audio channels from the existing spatial audio channel as forming a raised channel of the lower channel audio signals.EFFECT: providing improved spatial perception of the audio signal reproduced by the audio system, wider range of available audio effects.13 cl, 7 dwg

Encoding device and method, decoding device and method and program // 2595544
FIELD: information technology.SUBSTANCE: invention relates to means of encoding and decoding of sound. Subband power calculation module calculates subband signal power for high-frequency subband among multiple sub-bands, components of input signal. High-frequency subband power calculation module performs weighing of power subband, having high power, as for subband, having plurality of high frequency subband, for calculation of power of high frequency subband for subband. Multiplexing scheme multiplexes encoded data and encoded data of low frequency for output. Encoded data of high frequency is selected based on high-frequency subband power and is obtained by encoding information used for producing high-frequency component of input signal by estimating, and coded data of low frequency is obtained by encoding low frequency components of input signal.EFFECT: technical result consists in improvement of accuracy of audio signal, obtained as result of decoding.17 cl, 6 dwg

ultimode audio signal decoder, multimode audio signal encoder, methods and computer programs using linear predictive coding based on noise limitation // 2591661
FIELD: acoustics.SUBSTANCE: invention relates to means of encoding and decoding audio signal. Audio signal decoder includes spectral processor designed to generate spectrum from set of spectral coefficients, or their preliminary processed versions, depending on set of linear prediction-domain parameters for part of audio encoded in linear prediction mode, and perform procedure of forming spectrum from set of coded spectral coefficients, or their preliminary processed versions, depending on parameters of set of scaling factors for part of audio content encoded in frequency domain.EFFECT: technical result consists in improvement of efficiency of encoding audio containing speech and non-vocal part, due to increase efficiency of encoding transitions between these parts.27 cl, 19 dwg

Apparatus and method for handling transient sound events in audio signals when changing replay speed or pitch // 2591012
FIELD: acoustics.SUBSTANCE: invention relates to means of audio signal processing. Device comprises time manipulator for individual treatment in time of plurality of sub-bands of sound signal. Time manipulator consists of covering and summation stages for covering and summation units, at least one of plurality of subband signals using value of covering and summation, which differs from improved value in module extraction, detector of transient processes to detection of transient process in audio signal or subranges signal, and multiple transient processes adders for summation of detected transient processes with multiple signals generated at stage of covering and summation. Stage of covering and summation is tuned to reduced effect of detected transient processes or for elimination of detected transient processes in combination.EFFECT: technical result consists in reduction of influence of transient processes at sound quality.17 cl, 19 dwg

Audio signal encoder, audio signal decoder, method for encoding or decoding audio signal using aliasing-cancellation // 2591011
FIELD: acoustics.SUBSTANCE: group of inventions relates to devices and methods of encoding and decoding audio signal with removal of aliasing (spectrum overlaying). Method includes steps of: transformation from time domain in frequency domain representation of input audio data to form in frequency domain representation of audio content; generation of spectrum frequency representation of audio or its pretreated modification depending upon set of linear prediction-domain parameters for fragment audio content which is encoded in area of linear prediction, to produce frequency representation of audio, calculated according to shape of spectrum; and generating signal representation stimulation results to obtain signal filtration stimulation results while taking into account at least some of multiple linear prediction-domain parameters alias-free signal synthesis with neutralisation of artefacts aliasing (spectrum overlaying) on side of audio decoder.EFFECT: technical result consists in neutralization of artefacts of aliasing when passing through audio signal decoder.18 cl, 25 dwg, 8 tbl

System and method of converting voice signal into transcript presentation with metadata // 2589851
FIELD: information technology.SUBSTANCE: present invention relates to techniques for speech recognition, that is, conversion of audio signal containing speech into a transcript representation. Method comprises receiving and preliminary processing of speech signal, converting speech signal group of digital filters into frequency areas, exceeding of relative energy in time of which creates a perception of language sounds, then standardising obtained frequency area taking into account characteristics of sensitivity of volute ear frequency, amplitude and time, after which acoustic criteria of speech signal and types of sounds, finally standardising time parameters and displaying a processed voice signal.EFFECT: technical result consists in improvement of accuracy of recognition of speech sounds.18 cl, 7 dwg

ethod of increasing legible and informative audio signals in the noise situation // 2589298
FIELD: physics.SUBSTANCE: invention relates to a means to improve the intelligibility and natural sounding audio tracks in acoustic noise environment. Technical result is to increase the intelligibility and naturalness of sound audio tracks in acoustic noise environment by reducing the effect of masking the useful sound unsteady acoustic noise by using frequency-dependent adaptive gain. Useful signal arriving at the processing unit, and the acoustic noise signal conditions coming from the surrounding space in the processing unit, is divided into frames. Processing unit is administered analysis filterbank and a synthesis filter bank which produces the subband decomposition of the useful signal and noise signal of acoustic environment and, accordingly, a composition of modified subband amplitude dependency of the useful signal after processing by the compressor. When the subband decomposition energy is calculated in each subband of the useful signal and noise signal sound environment. As the compressor processing unit using adaptive dynamic range compressor (AKDD) which alter the dynamic range of the useful signal.EFFECT: signals in the subbands desired signal multiplied by a gain.3 cl, 13 dwg

Encoding device and method, decoding device and method and program // 2589293
FIELD: physics.SUBSTANCE: invention relates to encoding and decoding audio signals. Bandpass filter divides input signal into a plurality of subband signals, circuit computing of characteristic quantity calculates a characteristic value using at least one of plurality of obtained by dividing subband signals and input signal evaluation circuit subband power treble calculates estimation value subband power of high frequency based on calculated characteristic amount and a high frequency signal generating circuit generates a high frequency component signal based on the set of subband signals extracted by a bandpass filter, and values of subband power estimates treble computed evaluation circuit power high frequency subband. Bandwidth extension device extends frequency range of the input signal using a high-frequency component signal generated by RF signal generating circuit. This invention can be applied, for example, in a bandwidth extending device, coding device, decoding device and so on.EFFECT: technical result is to increase sound quality of encoded audio signal.16 cl, 34 dwg

Audio signal decoder, audio signal encoder, methods and computer program using sampling rate dependent time-warp contour encoding // 2586848
FIELD: sound.SUBSTANCE: invention relates to encoding and decoding an audio signal. Audio signal decoder configured to provide a decoded audio signal representation on the basis of an encoded audio signal representation comprising a sampling frequency information, an encoded time warp information and an encoded spectrum representation comprises a time warp calculator and a warp decoder. Time warp calculator is configured to adapt a mapping rule for mapping codewords of the encoded time warp information onto decoded time warp values describing the decoded time warp information in dependence on the sampling frequency information. Warp decoder is configured to provide the decoded audio signal representation on the basis of the encoded spectrum representation and in dependence on the decoded time warp information.EFFECT: technical result is to increase the coding efficiency.17 cl, 35 dwg
 
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