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

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

Processing device and method of processing input audio signal using cascaded filter bank // 2586846
FIELD: sound.SUBSTANCE: invention relates to means for processing an input audio signal based on a cascade filter bank. Device comprises a bank of synthesis filters for synthesis of an intermediate audio signal from an input audio signal, an input audio signal of a set of first subband signals generated in a bank of analysis filters, wherein number of channels in said bank of synthesis filters is less than number of channels in bank of analysis filters. Device also includes additional bank of analysis filters to generate multiple second subband signals from intermediate audio signal, wherein said additional bank of analysis has number of channels different from number of channels in bank of synthesis filters, so that sampling frequency of subband signal from a plurality of second subband signals differs from sampling frequency of first subrange signal from a plurality of first subband signals.EFFECT: technical result is to improve quality of processed audio signal.23 cl, 52 dwg, 2 tbl

Apparatus and method for encoding and decoding method device and program // 2586011
FIELD: sound.SUBSTANCE: invention relates to encoding apparatus and encoding method, decoding device and decoding method can be used to obtain high-quality audio. Encoding device includes a sub-band separation module, quasi-power calculation unit for sub-bands of high and low frequency, characteristic value calculation unit configured to calculate the number of areas to determine the number of continuous sections of the frame, for which the same factor assessment is selected, selection module multiples the frame included in the composition portion of continuous frames, encoding module low frequency signal input, a multiplexing unit for generating an output code string. Decoding apparatus comprises an input string code data demultiplexing module for the selected coefficient estimation section frames.EFFECT: technical result achieved - improving the quality of sound while reducing the amount of coding.19 cl, 14 dwg

Generation of noise in audio codecs // 2585999
FIELD: acoustics.SUBSTANCE: invention relates to means of generating noise in audio codecs. Audio encoder includes background noise estimation module configured to determine parametric assessment of background noise on the basis of representation in the form of spectral decomposition of input audio signal so that parameter estimate of background noise spectral describes spectral envelope background noise input audio signal. Audio encoder includes an encoder for encoding an input audio signal into a data stream for active phase. Audio encoder has a detector configured to detect input in inactive phase after active phase based on an input signal. Audio encoder can encode the data stream parametric assessment of background noise in the inactive phase.EFFECT: technical result consists in reducing the bit rate and improved quality of the generated noise.18 cl, 13 dwg

Device and method for encoding by huffman method // 2585990
FIELD: radio engineering and communications.SUBSTANCE: invention is intended for encoding and decoding of audio/speech. Huffman table may be developed independently by means of large data base of input sequences. In method, interval of quantization indices values (or difference of indices) is defined for encoding by Huffman method. For each value of this interval is assembled all input signals, having same interval of values, and calculating probability distribution of each quantisation index values (or difference of indices) within this interval. For each value of created interval one Huffman table is made in accordance with probability of occurrence of each possible values of input signal.EFFECT: high accuracy of encoding and decoding audio signal.7 cl, 14 dwg

Low latency audio encoding, comprising alternating predictive coding and transform coding // 2584463
FIELD: acoustics.SUBSTANCE: invention relates to means of encoding digital audio signal. Encoding a previous frame of samples of a digital signal through predictive coding. Encoding a current frame of samples of digital signal through transform coding. Method is implemented so that a first portion of current frame is further encoded by predictive coding which is reduced compared to predictive coding of previous frame by reusing at least one parameter of predictive coding of previous frame and encoding only non-reused parameters of said first part of current frame. Invention also provides a decoding method corresponding to coding method described. Object thereof is also an encoder and a decoder, in which described methods of encoding and decoding are respectively used.EFFECT: technical result is to reduce number of bits required to transmit encoded signal without changing encoding quality.17 cl, 13 dwg

ethod and system for encoding audio data with adaptive low frequency compensation // 2583717
FIELD: physics.SUBSTANCE: audio encoding method, which includes performing tonality detection on frequency domain audio data to generate compensation control data indicative of whether each low frequency band of a set of at least some low frequency bands of the audio data has prominent tonal content; for the said each low frequency band, generating a preliminary masking value for the audio data in the band; for the said each low frequency band, determining a masking value for the audio data in the band, wherein the masking value for the audio data in each said low frequency band having the prominent tonal content as indicated by the compensation control data is obtained by performing low frequency compensation to correct the preliminary masking value for the audio data in the band, and the masking value for each other low frequency band in the set is the preliminary masking value for the audio data in the band.EFFECT: adaptive application of low frequency compensation when encoding audio signals having prominent low frequency tonal components without changing the decoder.28 cl, 7 dwg

Bandwidth extension method, bandwidth extension apparatus, program, integrated circuit and audio decoding apparatus // 2582061
FIELD: computer engineering.SUBSTANCE: invention relates to means of expansion of bandwidth. According to method of bandwidth expansion low frequency band width signal is converted into QMF area to form first low-frequency QMF spectrum; signals with shifted main tone generated by applying various shift factors to low-frequency bandwidth signal; high-frequency QMF spectrum by means of stretching in time signals with shifted main tone in QMF region; high-frequency QMF spectrum is modified and modified high-frequency QMF spectrum combined with first low-frequency QMF-spectrum.EFFECT: technical result consists in providing possibility of reducing amount of computations while widening bandwidth and suppression of deterioration of quality in width of band to be extended.19 cl, 2 tbl, 18 dwg

Information signal presentation using overlapping conversion // 2580924
FIELD: radio engineering, communication.SUBSTANCE: invention relates to means of presenting information signals using overlapping conversion. An information signal recovery module is configured to recover, using spectrum aliasing suppression, an information signal from a presentation of the overlapping conversion of the information signal comprising, for each of successive overlapping regions of the information signal, inverse conversion of the window of the version of the corresponding region, wherein the information signal recovery module is configured to recover an information signal at a sampling frequency which varies at the boundary between the preceding region and the subsequent region of the information signal. An information signal recovery module comprises a re-converter, configured to apply re-conversion to the inverse conversion of the window of the version of the preceding region, so as to obtain re-conversion for the preceding region, and apply re-conversion to the inverse conversion of the window of the version of the subsequent region.EFFECT: high coding efficiency.23 cl, 13 dwg

Encoding apparatus and decoding method // 2579663
FIELD: sound.SUBSTANCE: invention relates to encoding means used in a communication system. Apparatus includes a sub-band formation unit that separates the conversion coefficient error on the first level of the M subbands so as to provide M sub-band transform coefficients; shape vector encoding unit that encodes each of the transform coefficients M subbands so as to obtain the M encoded shape information, and calculates a target gain for each of the M subband transform coefficients; gain vector generation unit which generates a gain vector using gain M target; gain vector encoding module that encodes the gain vector so as to obtain gain encoded information; and multiplexing module section that multiplexes the encoded shape information from the encoded information enhancement.EFFECT: technical result is to increase the sound quality of the decoded signal.17 cl, 36 dwg

Encoding apparatus and decoding method // 2579662
FIELD: communications.SUBSTANCE: invention relates to encoding means used in a communication system. Apparatus includes a sub-band formation unit which separates first error transform coefficient levels for M subbands so as to provide M sub-band transform coefficients; a shape vector encoding unit that encodes each of the transform coefficients of M subbands so as to obtain M encoded shape information, and calculate a target gain for each of the M subband transform coefficients; a gain vector generation unit which generates a gain vector using M target gains; a gain vector encoding module that encodes the gain vector, so as to obtain gain encoded information; and a multiplexing section module that multiplexes the encoded shape information from the encoded gain information.EFFECT: technical result is improved sound quality of the decoded signal.5 cl, 36 dwg

Linear prediction-based coding scheme using spectral domain noise shaping // 2575993
FIELD: physics, audio.SUBSTANCE: invention relates to a method of encoding an audio signal and means of carrying out said method. An encoding concept, which is linear prediction-based using spectral decomposition of an input audio signal to compute linear prediction coefficients, uses spectral domain noise shaping based on the computed linear prediction coefficients. The coding efficiency may remain even if such a lapped transform is used for the spectral decomposition which causes aliasing and necessitates time aliasing cancellation such as critically sampled lapped transforms such as an MDCT.EFFECT: providing a coding concept which enables to reduce complexity with comparable or even higher coding efficiency.13 cl, 4 dwg

Encoder using forward aliasing cancellation // 2575809
FIELD: physics, computer engineering.SUBSTANCE: invention relates to an encoder which supports switching between time-domain aliasing cancellation transform coding mode and time-domain coding mode. The result is achieved by adding a further syntax portion to frames, depending on which the parser of a decoder may select between a first action of expecting the current frame to contain, and thus reading forward aliasing cancellation data from the current frame and a second action of not expecting the current frame to contain, and thus not reading forward aliasing cancellation data from the current frame.EFFECT: codec is made less liable to frame loss.20 cl, 27 dwg

Device and method for encoding/decoding for high-frequency band extension // 2575680
FIELD: radio engineering, communication.SUBSTANCE: encoding device can reduce input signal sampling, perform basic encoding of the input signal with reduced sampling, perform frequency conversion of the input signal and perform encoding with bandwidth extension using the basic signal of the input signal in the frequency domain.EFFECT: high accuracy of encoding and decoding a signal in high-frequency band extension modes.20 cl, 38 dwg

Gain factor correction in audio coding // 2575389
FIELD: communications.SUBSTANCE: invention relates to gain factor correction in audio coding based on circuit sampling, and may be used for processing different types of audio signals. Method of gain factor adjustment in decoding the audio signals encoded with separate representations of gain factor and shape vector comprehends estimation of shape vector representation precision factor, determination of gain factor correction based on precision estimated figure, adjustment of gain representation based on the determined gain factor correction.EFFECT: technical result is gain factor adjustment in decoding the audio signals encoded with separate representations of gain factor and shape vector.28 cl, 21 dwg, 2 tbl

Transform audio codec and methods for encoding and decoding time segment of audio signal // 2574851
FIELD: physics, acoustics.SUBSTANCE: invention relates to means of encoding/decoding the time segment of an audio signal. The method comprises deriving an indicator z of the position on a frequency scale of a residual vector associated with the time segment of the audio signal; deriving a measure Φ, related to the size of the structure of the residual vector; determining whether a predefined criterion involving the measure Φ, the indicator z and a predefined threshold θ, is fulfilled, which corresponds to estimating whether a change of sign of at least some of the non-zero coefficients of the residual vector would be audible after reconstruction of the audio signal time segment; encoding the respective amplitude of the coefficients of the residual vector, and encoding the signs of the coefficients of the residual vector only when it is determined that the criterion is fulfilled, and thus, that a change of sign would be audible.EFFECT: high encoding efficiency in a transform audio codec.26 cl, 8 dwg

Apparatus and method for encoding and decoding audio signal using aligned look-ahead portion // 2574849
FIELD: radio engineering, communication.SUBSTANCE: windower for applying a prediction coding analysis window to a stream of audio samples to obtain windowed data for prediction analysis and for applying a transform coding analysis window to the stream of audio samples to obtain windowed data for transform analysis. The transform coding analysis window is associated with audio samples within a current frame of audio samples and with audio samples of a predefined portion of a future frame of audio samples which is a transform-coding look-ahead portion. The prediction coding analysis window is associated with the portion of the audio samples of the current frame and with audio samples of a predefined portion of the future frame which is a prediction coding look-ahead portion.EFFECT: high quality of the encoded audio signal.26 cl, 17 dwg

Audio encoder, audio decoder, method of encoding audio information, method of decoding audio information and computer programme using hash table describing significant state values and interval boundaries // 2574848
FIELD: physics, acoustics.SUBSTANCE: invention relates to means of encoding audio information. An audio decoder for providing decoded audio information based on encoded audio information includes an arithmetic decoder for providing a plurality of decoded spectral values based on an arithmetically encoded representation of the spectral values and a frequency domain-to-time domain converter for providing a time-domain audio representation using the decoded spectral values, in order to obtain the decoded audio information. The arithmetic decoder is configured to select a mapping rule describing mapping of a code value onto a symbol code depending on a context state described by a numeric current context value. The arithmetic decoder is configured to determine the numeric current context value depending on a plurality of previously decoded spectral values. A similar concept is employed in the audio encoder.EFFECT: high encoding efficiency.18 cl, 67 dwg

ethod of encoding and decoding, coder and decoder, programme and recording carrier // 2571561
FIELD: physics.SUBSTANCE: sequence of frequency area counts isolated from acoustic signal is divided by weighed envelope and, then, to the gain. Obtained result is quantised while every count is subjected to variable-length encoding. The error between quantising and count after quantising is quantised with the help of data stored in said variable-length encoding. This quantising is executed by the rule that sets the counts in compliance with the number of memorised bits the errors of which should be quantised. At decoding, variable-length codes in sequence of codes being loaded are decoded to get the frequency area counts series. The error signal is additionally decoded by the rule depending on the variable-length code bits. Obtained series of counts is used to derive the initial series of counts in compliance with the auxiliary data.EFFECT: higher efficiency of acoustic signal encoding at encoding at low bit rate.38 cl, 6 dwg

Bandwidth expansion coder, bandwidth expansion decoder and phase vocoder // 2563164
FIELD: physics, acoustics.SUBSTANCE: invention relates to bandwidth expansion means. Audio signal coder comprises signal analyser, root coder and computer of parameters. Audio signal comprises LF signal covering central frequency band and HF signal treble band. Signal analyser is intended for audio signal analysis with audio count unit of definite length in time. Besides, signal analyser selects analysis window from the set of windows to be used in expansion of bandwidth on the side of bandwidth expansion decoder. Rood coder for encoding of LF signal outputs coded signal of frequency-coded signal. Computer of parameters calculates bandwidth expansion parameters on the basis of HF signal.EFFECT: better properties of output audio signal acoustic performances.23 cl, 15 dwg

ixing input information streams // 2562395
FIELD: physics, acoustics.SUBSTANCE: invention relates to mixing a plurality of input information streams in video- and teleconferencing. The technical result is achieved through a device for mixing a plurality of input information streams, wherein each of the input information streams contains an audio data frame in a spectral region, an input information stream frame containing spectral information for a plurality of spectral components.EFFECT: higher throughput of a conference transmission system by describing spectral information of one spectral component in compressed form.11 cl, 14 dwg

Device and method for processing of decoded audio signal in spectral band // 2560788
FIELD: physics, audio.SUBSTANCE: invention relates to audio processing, particularly, to processing of decoded audio signal. Proposed device comprises decoded signal filter to get filtered audio signal. Time-spectrum converter cascade to convert decoded audio signal and filtered audio signal into appropriate spectral patterns. Note here that every spectral pattern features multiple subband signals. It incorporates weighing module to weigh selectively the filtered audio signal by multiplication of subband signals by appropriate weighing factors to get weighted filtered audio signal. Used subtraction module executes subtraction in subbands between weighted filtered audio signal and spectral pattern of decoded audio signal. Spectrum-time converter serves to convert resultant audio signal or signal isolated therefrom in presentation in time band to get a processed decoded audio signal.EFFECT: after-processing with low lag of decoded audio signal.16 cl, 13 dwg

Encoding method, encoder, method of determining periodic feature value, device for determining periodic feature value, programme and recording medium // 2554554
FIELD: physics, acoustics.SUBSTANCE: invention relates to encoding an audio signal. An encoding method for encoding a sample sequence in a frequency domain which is derived from an audio signal in frames, the method comprising: an interval determination step of determining an interval T between samples from a set S of candidates for the interval T, the interval T corresponding to a periodicity of the audio signal or to an integer multiple of the fundamental frequency of the audio signal; an additional information generating step of encoding the interval T determined at the interval determination step to obtain additional information; and a sample sequence encoding step of encoding a rearranged sample to obtain a code sequence.EFFECT: high quality of encoding an audio signal with a low bit-rate with less processing.22 cl, 10 dwg

Bandwidth expansion device // 2552184
FIELD: radio engineering, communication.SUBSTANCE: invention relates to bandwidth expansion devices. An excitation signal based on an acoustic signal is generated; with that, the acoustic signal includes a variety of frequency components. A feature vector is distinguished out of the acoustic signal; with that, the feature vector includes at least one feature of a component in a frequency domain and at least one feature of a component in a time domain. At least one parameter of the spectrum shape is determined based on the feature vector; with that, at least one parameter of the spectrum shape corresponds to a sub-range signal containing frequency components that belong to an additional variety of frequency components. A signal of the sub-range is generated by the filtration of an excitation signal by means of a filter bank and weighing of a filtered excitation signal using at least one parameter of the spectrum shape.EFFECT: technical result consists in the improvement of perception of an expanded acoustic signal.21 cl, 10 dwg

Cross product-enhanced, subband block-based harmonic transposition // 2551817
FIELD: physics, acoustics.SUBSTANCE: invention relates to systems for encoding audio signal sources. Provided is subband block-based harmonic transposition, where the time block of complex discrete values of subbands is processed by common phase modification. Superposition of multiple modified discrete values yields the resultant effect of limiting undesirable cross products, making it possible to use coarser frequency resolution and/or lesser degree of oversampling. In one embodiment, the invention further includes a window function suitable for use with cross product-enhanced, subband block-based HFR. A hardware embodiment may include an analysing filter unit (101), a control data-configurable subband processing module (102) and a synthesising filter unit (103).EFFECT: efficient implementation of high-frequency reconstruction (HFR) through enhancement with cross products, where a new component with frequency QΩ+rΩ0 is generated based on existing components with frequencies Ω and Ω+Ω0.63 cl, 9 dwg

Signal processing device and method, encoder and encoding method, decoder and decoding method and programme // 2550550
FIELD: physics, computer engineering.SUBSTANCE: present invention relates to signal processing means. An encoder sets an interval including 16 frames as interval section to be processed, outputs high-frequency band encoded data to obtain the high-frequency band component of an input signal and low-frequency band encoded data obtained by encoding the low-frequency band signal of the input signal for each section to be processed. In this case, for each frame, a coefficient used in estimation of the high-frequency band component is selected and the section to be processed is divided into continuous frame segments including continuous frames from which the coefficient with the same section to be processed is selected. In addition, high-frequency band encoded data are produced which include data including information indicating the length of each continuous frame segment, information indicating the number of continuous frame segments included in the section to be processed and a coefficient index indicating the coefficient selected in each continuous frame segment.EFFECT: improved sound quality with frequency band expansion.23 cl, 51 dwg

Signal processing device and method and programme // 2550549
FIELD: radio engineering, communication.SUBSTANCE: invention relates to signal processing means. The system receives an encoded low-frequency band signal and encoded energy information used for frequency shift of the encoded low-frequency band signal. The low-frequency band signal is decoded and energy suppression of the decoded signal is smoothed. The smoothed low-frequency band signal is frequency shifted to generate a high-frequency band signal. The low-frequency band signal and the high-frequency band signal are then merged and output.EFFECT: high quality of the decoded signal.20 cl, 14 dwg
 
2551215.
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