Systems employing more than two channels, e.g. quadraphonic and and (H04S3)

H   Electricity(223121)
H04S3                 Systems employing more than two channels, e.g. quadraphonic (h04s0005000000, h04s0007000000 take precedence);;(70)
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

Improved reproduction of multiple audio channels // 2605038
FIELD: acoustics.SUBSTANCE: present invention relates to multichannel audio. Invention discloses a method of reproducing multiple audio channels, according to which first and second sets of out-of-phase information are extracted from side and/or rear side channels, contained in multichannel audio signal. Said sets of out-of-phase information are applied to first and second vertical height loudspeakers, respectively.EFFECT: technical result is improvement of reproduction of multichannel audio signal.15 cl, 10 dwg

Device and method of generating output audio signals using object-oriented metadata // 2604342
FIELD: acoustics.SUBSTANCE: invention relates to processing audio signals. Device for generating at least one output audio signal, which is an overlapping of at least two different audio objects, includes a processor for processing an input audio signal to provide an object representation of the input audio signal, where the object representation can be generated by parametrically guided approximation of original objects using the object downmix signal. Object manipulator individually controls the objects using object-oriented audio metadata relating to individual audio objects to obtain manipulated audio objects. Manipulated audio objects are mixed using the object mixer in order to, finally, get the output audio signal having single- or multi-channel signals depending upon a specific rendering setup.EFFECT: technical result is the increase of signal transmission speed.12 cl, 17 dwg

ethod and device for decomposing stereophonic record using frequency-domain processing applied with spectral weights generator // 2601189
FIELD: information technology.SUBSTANCE: invention relates to means of generating a stereophonic side signal from a stereophonic input signal. Device comprises a generator of information on changes to generate information on changing basing on information on a mid/side signal. Besides, the device includes a signals manipulation unit designed to manipulate the first input channel on the basis of the information on changes to obtain a first side channel and able to manipulate the second input channel on the basis of the information on changes to obtain a second side channel. Generator of information on changes comprises a generator of spectral weights for generating information on the change by forming a first spectral weighting coefficient based on a monophonic mid signal and a monophonic side signal in the stereophonic input signal.EFFECT: technical result is forming additional channels from a stereophonic input signal.16 cl, 24 dwg, 1 tbl

Audio system and method for operation thereof // 2595943
FIELD: sound.SUBSTANCE: invention relates to an audio system, particularly to virtual spatial reproduction of audio signals. Audio system comprises a receiver for receiving an audio signal, such as an audio object or a signal of a channel of a spatial multi-channel signal. Binaural circuit generates a binaural output signal by processing audio signal. Processing is representative of a binaural transfer function providing a virtual sound source position for audio signal. Measurement circuit generates measurement data indicative of a characteristic of acoustic environment, and a determining circuit determines an acoustic environment parameter in response to measurement data. Acoustic environment parameter may typically be a reverberation parameter, such as a reverberation time. Adaptation circuit adapts binaural transfer function dynamically in response to acoustic environment parameter. For example, adaptation may modify a reverberation parameter to more closely resemble reverberation characteristics of acoustic environment.EFFECT: technical result is providing complete spatial audio perception on basis of binaural signals.14 cl, 7 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

Audio signal processor for processing encoded multi-channel audio signals and method therefor // 2595910
FIELD: communication.SUBSTANCE: invention relates to simultaneous rendering of multi-channel signals. An audio signal processor receives a plurality of encoded multi-channel audio signals. A multi-channel decoder decodes a first encoded multichannel signal, to generate the first decoded multi-channel signal. A generator generates an encoded further audio signal selecting audio encoding data. A further decoder generates a further decoded signal by decoding the further encoded audio signal. A combiner combines the first decoded multi-channel signal and the further decoded signal to generate a multi-channel output signal.EFFECT: technical result is improved processing, maintaining low complexity and and/or reduced computational load, improved audio quality and facilitated operation.15 cl, 4 dwg

System and method for reproduction of sound // 2589377
FIELD: acoustics.SUBSTANCE: invention relates to means of reproducing audio signal. System comprises a first sound transducer arrangement arranged to generate sound reaching a nominal position from a first position corresponding to first direction; and a second sound transducer arrangement arranged to generate sound reaching nominal position from a second position corresponding to a different direction than first direction. Arrangements may specifically be loudspeakers positioned at given positions. Drive circuit generates a first drive signal for first sound transducer arrangement and a second drive signal for second sound transducer arrangement from audio signal. First position and second position are located on cone mixing sounds for nominal position and nominal direction. More flexible loudspeaker positioning may be achieved.EFFECT: high flexibility of location of loudspeakers, increase of level of sound pressure and improved quality of spatial perception.15 cl, 11 dwg

Hybrid encoding of multichannel sound // 2581782
FIELD: information technology.SUBSTANCE: invention relates to means for coding and decoding multi-channel audio signal. A method of encoding of a multi-channel input audio signal includes the steps of forming the down-mixing the low frequency components of a subset of channels of the input signal waveform, encoding each downmix channel, thereby forming subjected downmixed data coded waveform perform parametric encoding at least some of the upper frequency components of each channel input, thereby forming a parametrically encoded data and generating a coded sound signal (e.g., coded signal format E-AC-3) indicating data subjected to downmix coded waveform and parametrically encoded data. Other aspects are methods of decoding this coded signal and a system adapted to perform any embodiment of the inventive method.EFFECT: technical result is to increase the quality of the encoded signal.30 cl, 4 dwg, 1 tbl

ethod of filtering binaural effects in audio streams // 2571921
FIELD: physics.SUBSTANCE: method comprises calculating the difference between frequencies of left side and right side channels of an audio stereo signal; presenting the digitised audio signal in the form of a certain set of amplitude readings derived through defined time intervals and representing a certain number of binary bits, and via Fourier transform, presenting the audio signal in the form of coefficients which correspond to amplitude and phase values of fundamental harmonics, after which malicious frequency effects in the audio file are identified. This enables to protect users of mass-communication equipment from open malicious effect of multimedia (audio) content in real time.EFFECT: enabling detection of malicious binaural effects in audio streams.4 dwg, 1 tbl

Device and method of generating output signal using signal decomposition unit // 2569346
FIELD: physics, acoustics.SUBSTANCE: invention relates to audio signal processing. A device for generating an output signal has at least two output channels and two input channels for an input signal; the device also includes a unit for decomposition into background/forward signals, a background modification unit and a combination unit, wherein the unit for decomposition into background/forward signals is configured to decompose at least two input channels of an input signal, each of which at least decomposes into a signal from a first group of signals and a signal from a second group of signals. The background modification unit is configured to modify a signal from the group of background signals or a signal extracted from a signal from the group of background signals to obtain a modified signal as a first output channel. A combination unit is configured to combine a signal from the group of background signals or a signal extracted from a signal from the group of background signals, and a signal from the group of forward signals or a signal extracted from a signal from the group of forward signals as a second output channel.EFFECT: high accuracy of recognising audio signals.19 cl, 20 dwg

Device and method of decomposing input signal using downmixer // 2555237
FIELD: physics, acoustics.SUBSTANCE: invention relates to audio processing and particularly to decomposing audio signals into different components. A device for decomposing an input signal, having at least three input channels, comprises a downmixer for downmixing the input signal to obtain a downmixed signal having fewer channels, an analyser for analysing the downmixed signal to obtain an analysis result which is forwarded to a signal processor for processing the input signal or the signal derived from the input signal in order to obtain a decomposed signal.EFFECT: high accuracy of reproducing stereo sound.15 cl, 16 dwg

Apparatus and method for decomposing input signal using pre-calculated reference curve // 2554552
FIELD: physics, acoustics.SUBSTANCE: invention relates to audio processing, particularly to decomposition of audio signals into different components, for example, differently detectable components. An apparatus for decomposing a signal having at least three channels comprises an analyser (16) for analysing a similarity between two channels of an analysed signal related to the signal having at least two analysed channels, wherein the analyser is configured to use a pre-calculated frequency-dependent similarity curve as a reference curve to determine the analysis result. The signal processor (20) processes the analysed signal or a signal derived from the analysed signal or a signal, from which the analysed signal is derived using the analysis result to obtain a decomposed signal.EFFECT: decomposing a signal using a pre-calculated frequency-dependent similarity curve as a reference curve.15 cl, 16 dwg

System and tools for perfected author development and presentation of 3d audio data // 2554523
FIELD: physics.SUBSTANCE: invention discloses perfected tools for author development and presentation of sound playback data. Some said tools allow combine said data for wide range of playback means. Playback data can be individually developed by creation of metadata for audio objects. Said metadata can be created with reference to zones of loudspeakers. Data of audio playback can be reproduced in compliance with loudspeakers arrangement for particular playback medium.EFFECT: simplified computer processing of 3D sound.42 cl, 47 dwg

ethod and device for encoding and decoding object-oriented audio signals // 2551797
FIELD: physics, acoustics.SUBSTANCE: invention relates to encoding and decoding an audio signal in which audio samples for each object audio signal may be localised in any required position. In the method and device for encoding an audio signal and in the method and device for decoding an audio signal, audio signals may be encoded or decoded such that audio samples may be localised in any required position for each object audio signal. The method of decoding an audio signal includes extracting from the audio signal a downmix signal and object-oriented additional information; generating channel-oriented additional information based on the object-oriented additional information and control information for reproducing the downmix signal; processing the downmix signal using a decorrelated channel signal; and generating a multichannel audio signal using the processed downmix signal and the channel-oriented additional information.EFFECT: high accuracy of reproducing object audio signals.7 cl, 20 dwg

ethod of encoding and device for decoding object-based audio signal // 2544789
FIELD: radio engineering, communication.SUBSTANCE: invention relates to means of encoding and decoding object-based audio signals. The method comprises extracting from the audio signal a first audio signal and a first audio parameter, wherein a musical object is channel-based encoded, and a second audio signal and a second audio parameter in which a vocal object is object-based encoded; generating a third audio signal using at least one of the first and second audio signals; generating a multi-channel audio signal using at least one of the first and second audio parameters and the third audio signal.EFFECT: providing means of encoding and decoding audio.9 cl, 16 dwg

ethod and apparatus for encoding and optimal reconstruction of three-dimensional acoustic field // 2533437
FIELD: physics, acoustics.SUBSTANCE: invention relates to means of encoding audio signals and related spatial information in a format which is independent of the playback scheme. A first set of audio signals is assigned to a first group. The first group is encoded as a set of mono audio tracks with associated metadata describing the direction of the signal source of each track relative to the recording position and the initial playback time thereof. A second set of audio signals is assigned to a second group. The second group is encoded as at least one set of ambisonic tracks of a given order and a mixture of orders. Two groups of tracks comprising the first and second sets of audio signals are generated.EFFECT: providing a technique capable of presenting spatial audio content independent of the exhibition method.26 cl, 11 dwg

Surround sound system and method therefor // 2525109
FIELD: physics, acoustics.SUBSTANCE: invention relates to a surround sound system. multi-channel spatial signal comprising at least one surround channel is received. Ultrasound is emitted towards a surface to reach a listening position via reflection of said surface. The ultrasound signal may specifically reach the listening position from the side, above or behind of a nominal listener. A first drive unit generates a drive signal for the directional ultrasound transducer from the surround channel. The use of an ultrasound transducer for providing the surround sound signal provides an improved spatial experience while allowing the speaker to be located, for example, in front of the user. An ultrasound beam is much narrower and well defined than conventional audio beams and can therefore be better directed to provide the desired reflections. In some scenarios, the ultrasound transducer may be supplemented by an audio range loudspeaker.EFFECT: high quality of reproducing audio and high efficiency of the surround sound system.12 cl, 11 dwg

Binaural rendering of multi-channel audio signal // 2512124
FIELD: physics, acoustics.SUBSTANCE: binaural rendering of a multi-channel audio signal into a binaural output signal is described. The multi-channel audio signal includes a stereo downmix signal (18) into which a plurality of audio signals are downmixed; and side information includes downmix information (DMG, DCLD), indicating for each audio signal, to what degree the corresponding audio signal was mixed in the first channel and second channel of the stereo downmix signal (18), respectively, as well as object level information of the plurality of audio signals and inter-object cross correlation information, describing similarity between pairs of audio signals of the plurality of audio signals. Based on a first rendering prescription, a preliminary binaural signal (54) is computed from the first and second channels of the stereo downmix signal (18). A decorrelated signal (Xdn,k) is generated as an perceptual equivalent to a mono downmix (58) of the first and second channels of the stereo downmix signal (18) being, however, decoded to the mono downmix (58).EFFECT: improved binaural rendering while eliminating restrictions with respect to free generation of a downmix signal from original audio signals.11 cl, 6 dwg, 3 tbl

Apparatus and method of generating output audio signals using object based metadata // 2510906
FIELD: physics, acoustics.SUBSTANCE: invention relates to processing signals in an audio frequency band. The apparatus for generating at least one output audio signal representing a superposition of two different audio objects includes a processor for processing an input audio signal to provide an object representation of the input audio signal, where that object representation can be generated by parametrically guided approximation of original objects using an object downmix signal. An object manipulator individually manipulates objects using audio object based metadata relating to the individual audio objects to obtain manipulated audio objects. The manipulated audio objects are mixed using an object mixer for finally obtaining an output audio signal having one or multi-channel signals depending on a specific rendering setup.EFFECT: providing efficient audio signal transmission rate.14 cl, 17 dwg

Generation of binaural signals // 2505941
FIELD: radio engineering, communication.SUBSTANCE: described is a device for generating a binaural signal based on a multi-channel signal representing a plurality of channels and intended for reproduction by a speaker system, wherein each virtual sound source position is associated to each channel. The device includes a correlation reducer for differently converting, and thereby reducing correlation between, at least one of a left and a right channel of the plurality of channels, a front and a rear channel of the plurality of channels, and a centre and a non-centre channel of the plurality of channels, in order to obtain an inter-similarity reduced combination of channels; a plurality of directional filters, a first mixer for mixing output signals of the directional filters modelling the acoustic transmission to the first ear canal of the listener, and a second mixer for mixing output signals of the directional filters modelling the acoustic transmission to the second ear canal of the listener. Also disclosed is an approach where centre level is reduced to form a downmix signal, which is further transmitted to a processor for constructing an acoustic space. Another approach involves generating a set of inter-similarity reduced transfer functions modelling the ear canal of the person.EFFECT: providing an algorithm for generating a binaural signal which provides stable and natural sound of a record in headphones.33 cl, 14 dwg

Apparatus for merging spatial audio streams // 2504918
FIELD: information technology.SUBSTANCE: method comprises estimating a first wave representation comprising a first wave direction measure characterising the direction of a first wave and a first wave field measure being related to the magnitude of the first wave for the first spatial audio stream, having a first audio representation comprising a measure for pressure or magnitude of a first audio signal and a first direction of arrival of sound; estimating a second wave representation comprising a second wave direction characterising the direction of the second wave and a second wave field measure being related to the magnitude of the second wave for the second spatial audio stream, having a second audio representation comprising a measure for pressure or magnitude of a second audio signal and a second direction of arrival of sound; processing the first wave representation and the second wave representation to obtain a merged wave representation comprising a merged wave field measure, a merged direction of arrival measure and a merged diffuseness parameter; processing the first audio representation and the second audio representation to obtain a merged audio representation, and forming a merged audio stream.EFFECT: high quality of a merged audio stream.15 cl, 7 dwg

Apparatus for determining converted spatial audio signal // 2499301
FIELD: physics.SUBSTANCE: improved processing of an audio signal can be achieved, if audio signals are converted to directional components. In other words, the present invention shows that improved spatial processing can be achieved, when the format of a spatial audio signal corresponds to directional components as recorded, for example, by a B-format directional microphone. Furthermore, the present invention shows that directional or omnidirectional components from different sources can be processed jointly and therewith with an increased efficiency. In other words, especially when processing spatial audio signals from multiple audio sources, processing can be carried out more efficiently, if the signals of the multiple audio sources are available in the format of their omnidirectional and directional components, as these can be processed jointly. In embodiments, therefore, audio effect generators or audio processors can be used more efficiently by processing combined components of multiple sources.EFFECT: improved spatial processing of an audio signal.16 cl, 11 dwg

Apparatus for generating multichannel audio signal // 2498526
FIELD: physics.SUBSTANCE: apparatus (100) for generating a multichannel audio signal (142) based on an input audio signal (102) comprises a main signal upmixing means (110), a section (segment) selector (120), a section signal upmixing means (110) and a combiner (140). The section signal upmixing means (110) is configured to provide a main multichannel audio signal (112) based on the input audio signal (102). The section selector (120) is configured to select or not select a section of the input audio signal (102) based on analysis of the input audio signal (102). The selected section of the input audio signal (102), a processed selected section of the input audio signal (102) or a reference signal associated with the selected section of the input audio signal (102) is provided as section signal (122). The section signal upmixing means (130) is configured to provide a section upmix signal (132) based on the section signal (122), and the combiner (140) is configured to overlay the main multichannel audio signal (112) and the section upmix signal (132) to obtain the multichannel audio signal (142).EFFECT: improved flexibility and sound quality.12 cl, 10 dwg

Lossless multi-channel audio codec using adaptive segmentation with random access point (rap) and multiple prediction parameter set (mpps) capability // 2495502
FIELD: information technology.SUBSTANCE: invention relates to lossless multi-channel audio codec which uses adaptive segmentation with random access point (RAP) and multiple prediction parameter set (MPPS) capability. The lossless audio codec encodes/decodes a lossless variable bit rate (VBR) bit stream with random access point (RAP) capability to initiate lossless decoding at a specified segment within a frame and/or multiple prediction parameter set (MPPS) capability partitioned to mitigate transient effects. This is accomplished with an adaptive segmentation technique that fixes segment start points based on constraints imposed by the existence of a desired RAP and/or detected transient in the frame and selects a optimum segment duration in each frame to reduce encoded frame payload subject to an encoded segment payload constraint. RAP and MPPS are particularly applicable to improve overall performance for longer frame durations.EFFECT: higher overall encoding efficiency.48 cl, 23 dwg

Surround sound virtualiser with dynamic range compression and method // 2491764
FIELD: physics.SUBSTANCE: method and system for generating output signals for reproduction by two physical speakers in response to input audio signals indicative of sound from multiple source locations including at least two rear locations. Typically, the input signals are indicative of sound from three front locations and two rear locations (left and right surround sources). A virtualiser generates left and right surround output signals suitable for driving front loudspeakers to emit sound that a listener perceives as emitted from rear sources. Typically, the virtualiser generates left and right surround output signals by transforming rear source input signals in accordance with a sound perception simulation function. To ensure that virtual channels are well heard in the presence of other channels, the virtualiser performs dynamic range compression on rear source input signals. The dynamic range compression is preferably performed by amplifying rear source input signals or partially processed versions thereof in a nonlinear way relative to front source input signals.EFFECT: separating virtual sources while avoiding excessive emphasis of virtual channels.34 cl, 9 dwg

Improved reproduction of multiple audio channels // 2479149
FIELD: information technologies.SUBSTANCE: invention discloses the method for reproduction of multiple audio channels, according to which out-of-phase information is extracted from side and/or rear side channels contained in a multi-channel audio signal.EFFECT: improved reproduction of a multi-channel audio signal.15 cl, 10 dwg

Audio coding using step-up mixing // 2474887
FIELD: information technologies.SUBSTANCE: audio decoder for decoding multi-object audio signal comprises module to compute factor of forecasting matrix C consisting of factors forecasts based on data about object level difference (OLD), as well as means for step-up mixing proceeding from forecast factors for getting first upmix audio signal tending first type audio signal and/or second upmix signal tending to second type audio signal. Note here that multi-object audio signal comprises coded audio signals of first and second types. Multi-object audio signal consists of downmix signal 112 and service info. Service info comprises data on first and second type signal levels in first predefined frequency-time resolution.EFFECT: separation of individual audio objects in mixing and decreasing/increasing channel number.20 cl, 24 dwg

ethod and apparatus for supporting speech perceptibility in multichannel ambient sound with minimum effect on surround sound system // 2467406
FIELD: physics, acoustics.SUBSTANCE: invention relates to processing audio signals, particularly to improving intelligibility of dialogue and oral speech, for example, in surround entertainment ambient sound. A multichannel audio signal is processed to form a first characteristic and a second characteristic. The first channel is processed to generate a speech probability value. The first characteristic corresponds to a first measured indicator which depends on the signal level in the first channel of the multichannel audio signal containing speech and non-speech audio. The second characteristic corresponds to a second measured indicator which depends on the signal level in the second channel of the multichannel audio signal primarily containing non-speech audio. Further, the first and second characteristics of the multichannel audio signal are compared to generate an attenuation coefficient, wherein the difference between the first measured indicator and the second measured indicator is determined, and the attenuation coefficient is calculated based on the obtained difference and a threshold value. The attenuation coefficient is then adjusted in accordance with the speech probability value and the second channel is attenuated using the adjusted attenuation coefficient.EFFECT: improved speech perceptibility.12 cl, 5 dwg

atrix decoder // 2456766
FIELD: information technologies.SUBSTANCE: in the method of matrix decoding of an audio signal, in which a stereophonic pair of signals Lt, Rt is received, besides, relative amplitudes and polarities of the pair determine reproducible direction of decoded signals, Lt and Rt are panned to outlets associated with front directions, depending on the index of the sum of Lt and Rt, exceeding the index of difference between Lt and Rt, and Lt and Rt are panned to outlets associated with rear directions, depending on the index of the sum of Lt and Rt, lower than the index of difference between Lt and Rt, and the stereophonic pair of signals Lt and Rt is varied to shift direction of reproduced signals by generation of a difference signal from signals Lt and Rt, scaling of the specified difference signal to a shift amplification ratio, and summation of the specified scaled difference signal with both signals Lt and Rt, in order to generate varied signals Lt and Rt, so that relative amplitudes and polarities of the varied pair Lt and Rt determine the reproducible direction of decoded signals.EFFECT: reduced volume of digital processing.15 cl, 6 dwg

User annunciation on microphone cover // 2449497
FIELD: radio engineering.SUBSTANCE: invention relates to a mechanism, which tracks signals of a secondary microphone in a mobile device with multiple microphones in order to warn a user, if one or more secondary microphones are covered at the moment, when the mobile device is used. In one example the estimate values of secondary microphone capacity averaged in a smoothed manner may be calculated and compared to the estimate value of the minimum noise level of the main microphone. Detection of microphone cover may be carried out by comparison of smoothed estimate values of secondary microphone capacity with an estimate value of minimum noise level for the main microphone. In another example the estimate values of the minimum noise level for signals of the main and secondary microphones may be compared with the difference in the sensitivity of the first and second microphones in order to detect whether the secondary microphone is covered. As soon as detection is over, a warning signal may be generated and issued to the user.EFFECT: improved quality of main sonic signal sound.37 cl, 9 dwg

Signal processing method and apparatus // 2449387
FIELD: information technology.SUBSTANCE: signal processing method involves: receiving a signal and spatial information which includes channel level difference (CLD) information, a channel prediction coefficient (CPC), interchannel coherence (ICC) information; obtaining mode information for determining the encoding scheme and modification flag information indicating whether the signal has been modified. If the mode information indicates an audio encoding scheme, the signal is decoded according to the audio encoding scheme. If the modification flag information indicates that the signal has been modified, restoration information is obtained after modification, which indicates the value for adjusting the window length applied to the signal; the window length is modified based on restoration information after modification and the signal is decoded using the window with the modified length. Further, based extension information, the base extension signal is determined; a downmix extended signal is generated, having a bandwidth which is extended using the base extension signal by restoring the high-frequency region signal; and a multichannel signal is generated by applying spatial information to the downmix extended signal.EFFECT: high signal encoding efficiency.7 cl, 22 dwg

ethod and apparatus for generating a binaural audio signal // 2443075
FIELD: acoustics.SUBSTANCE: apparatus for generating a binaural audio signal includes a de-multiplexer (401) and decoder (403) which receives audio data comprising an audio M-channel audio signal which is a downmix of an N-channel audio signal and spatial parameter data for upmixing the M-channel audio signal to the N-channel audio signal. A conversion processor (411) converts spatial parameters of the spatial parameter data into first binaural parameters in response to at least one binaural perceptual transfer function. A matrix processor (409) converts the M-channel audio signal into a first stereo signal in response to the first binaural parameters. A stereo filter (415, 417) generates the binaural audio signal by filtering the first stereo signal. The filter coefficients for the stereo filter are determined in response to the at least one binaural perceptual transfer function by a coefficient processor (419).EFFECT: improved quality of generated binaural signal with decreased consumption of computing and memory resource.18 cl, 6 dwg

Device and method to synthesise output signal // 2439719
FIELD: information technologies.SUBSTANCE: device to synthesise an output signal comprises a decorrelator (356) and a convergence assembly (364). The decorrelator (356) provides for a decorrelated single-channel signal or decorrelated signals of the first and second channels on the basis of a step-down mixing signal, which contains signals of step-down mixing of the first and second audio objects, and is a result of step-down mixing of multiple signals of audio objects in compliance with information on step-down mixing (354). The convergence assembly (364) performs weighted convergence of a step-down mixing signal (352) and a decorrelated signal (358) with application of weight ratios (P, Q, C0, G), calculation of which is carried out on the basis of data on step-down mixing (354), specified characteristics of audio rendering (360), determining a virtual position of audio objects in a virtual sound space, and parametric data on audio objects (362), which describe these audio objects.EFFECT: development of a method for audio object coding, in which quality of objects reproduction in a stereo soundtrack will be most close to reference stereo sound transfer.28 cl, 24 dwg

Apparatus and method for multichannel parametric conversion // 2431940
FIELD: information technology.SUBSTANCE: converter generates parameters which determine the relationship between a first and a second channel for a multichannel audio signal, associated with configuration of a multichannel acoustic system. Level parameters are generated based on object parameters from a plurality of audio objects associated with a downmixing channel, which are generated using audio signals of an object associated with audio objects. Object parameters contain an energy parameter which indicates energy of the audio signal of the object. A parametric generator is used to obtain coherence and level parameters which combine the energy parameter and reproduction parameters of the object, and which depend on the desired reproduction configuration.EFFECT: less complex application of various systems which are designed to encode and decode parametric multichannel audio streams.27 cl, 10 dwg

Audio coding and decoding // 2427978
FIELD: information technologies.SUBSTANCE: audio signal coder comprises a facility to receive M-channel audio signal, where M>2, a facility of downmix to downmix M-channel audio signal into the first stereo signal and related parametric data, a facility of modification to modify the first stereo signal in order to generate the second stereo signal in response to related parametric data and data of spatial parameters, which specify transfer function of binaural perception, besides, the second stereo signal is a binaural signal, a facility for coding of the second stereo signal with the purpose to generate coded data and an output facility to generate out data flow, containing coded data and related parametric data.EFFECT: increased efficiency of stereo coding of multichannel signals with reduction of coding complexity.35 cl, 11 dwg

Hybrid derivation of surround sound audio channels by controllably combining ambience and matrix-decoded signal components // 2422922
FIELD: information technology.SUBSTANCE: method of obtaining two surround sound audio channels from two input audio signals, wherein said audio signals may include components generated by matrix encoding, comprising steps for obtaining ambience signal components from said audio signals, obtaining matrix-decoded signal components from said audio signals, and controllably combining ambience signal components and matrix-decoded signal components to provide said surround sound audio channels, wherein said controllable combination comprises application of gain scale factors.EFFECT: generation of a pleasant multi-channel signal from a double-channel signal which is either matrix-encoded or non-matrix-encoded without need for the listener changing modes.23 cl, 7 dwg, 1 tbl

Improved spatial resolution of sound field for multi-channel audio playback systems by deriving signals with high order angular terms // 2420027
FIELD: physics.SUBSTANCE: received set of input audio signals representing the sound field as a function of angular directions with zero-order and first-order angular terms is analysed in order to derive statistical characteristics of one or more angular directions of acoustic energy in the sound field. A set of processed signals is derived from weighted combinations of the input audio signals in which the input audio signals are weighted according to the statistical characteristics. The input audio signals and the processed signals represent the sound field as a function of angular direction with angular terms of one or more orders greater than one.EFFECT: high spatial resolution of audio signals, which enables to accurately recreate the audio perception of an acoustic phenomenon.36 cl, 21 dwg

ethods and devices to code and to decode audio signals based on objects // 2420026
FIELD: information technologies.SUBSTANCE: method and device to code audio signals are proposed, as well as a device of audio signals coding. Method to decode audio includes extraction of a step-down signal and additional information on the basis of an object from an input audio signal, formation of reproduction information on the basis of input control data and formation of space information on the basis of reproduction information and additional object-based information.EFFECT: invention provides decoding of audio signals, in which sound images may be arranged in any desired position for each object audio signal.11 cl, 20 dwg

Audio coding // 2419249
FIELD: information technologies.SUBSTANCE: module (23) of a space decoder is arranged with the possibility to convert one or more audio channels (s; l, r) into a pair of binaural output channels (lb, rb). The device comprises a module (234) of a parametre conversion, intended to convert space parametres (sp) into binaural parametres (bp), which contain binaural information. The device additionally comprises a module (232) of space synthesis intended to convert audio channels (L, R) into a pair of binaural signals (Lb, Rb) using binaural parametres (bp). The module (232) of space synthesis preferably operates in the field of conversion, such as QMF area.EFFECT: improved efficiency of voice signal conversion into a binaural output signal.12 cl, 9 dwg

Coding and decoding of sound // 2418385
FIELD: information technologies.SUBSTANCE: sound coder (109) has a structure of hierarchical coding and generates a data flow, containing one or more sound channels, and also parametric data of sound coding. The coder (109) comprises a processor of coding structure (305), which inserts data of the decoder treelike structure into the data flow. The decoder treelike structure data contains at least one data value, which indicates characteristic of channel division for the sound channel at the hierarchical layer of the hierarchical decoder structure, and may specifically define treelike structures of the decoder, which will be used by the decoder. The decoder (115) comprises a receiver (401), which receives the data flow, and the processor of the decoder structure (405) to generate the hierarchical decoder structure in response to the decoder treelike structure data. The decoding processor (403) then generates output sound channels from the data flow, using the structure of the hierarchical decoder.EFFECT: provision of efficient coding of the hierarchical decoder structure information in data of the decoder treelike structure.35 cl, 14 dwg

Audio signal processing method and device // 2417549
FIELD: information technology.SUBSTANCE: disclosed is a method of processing an audio signal, involving reception of a step-down mixed signal, information on the object and information on mixing; generation of information on step-down mixing processing using information on the object and information on mixing; processing the step-down mixed signal using information on mixing; and generation of multichannel information using information on the object and information on mixing, where the number of channels for the step-down mixed signal is equal to the number of channels for the processed step-down mixed signal.EFFECT: providing unlimited gain control when processing an audio signal and object panning based on the user selection.19 cl, 21 dwg, 4 tbl

ethod and apparatus for improving audio playback // 2416172
FIELD: physics.SUBSTANCE: audio signal, having at least one audio channel and associated direction parametres which indicate the direction of the origin of part of the audio channel relative the position of audio recording, is restored to obtain a reconstructed audio signal. The desired direction of the origin relative the position of audio recording is selected. Part of the audio channel is altered to obtain a reconstructed part of the reconstructed audio signal, where alteration includes amplifying intensity of part of the audio channel having direction parametres which indicate the direction of origin lying near the desired direction of origin relative the other part of the audio channel, having direction parametres which indicate the direction of origin lying far from the desired direction of origin.EFFECT: improved perception of the direction of the source of a reconstructed audio signal.19 cl, 8 dwg

Enhancing audio signal with remixing capability // 2414095
FIELD: physics.SUBSTANCE: one or more attributes (e.g., pan, gain, etc.) associated with one or more objects (e.g., instruments) of a stereo or multi-channel audio signal can be modified to provide remix capability.EFFECT: efficient audio signal coding.50 cl, 26 dwg

ethods for improvement of dialogues // 2408164
FIELD: information technologies.SUBSTANCE: multi-channel audio signal (in particular, stereophonic audio signal) is processed to change multiplication (loudness) of signal of voice component relative to signal of surrounding component (for instance, reflected sound) or signals of other components. Method for processing of audio signal consists in production of multi-channel audio signal including signal of voice component and signal of other component, definition of mutual correlation between two channels of audio signal, definition of spatial arrangement of voice component signal with application of mutual correlation and value of multiplication to control level of each channel of audio signal, identification of voice component signal on the basis of spatial arrangement of voice component signal, variation of voice component signal by means of application of multiplication to signal of voice component and generation of changed audio signal, including varied signal of voice component.EFFECT: improved quality of dialogues relative to environment and signals of other components.23 cl, 7 dwg

Generation of spatial signals of step-down mixing from parametric representations of multichannel signals // 2407226
FIELD: information technologies.SUBSTANCE: signal (314) of step-down mixing for headphones may be efficiently produced from parametric step-down mixing of multichannel signal (312), when modified HRTF (310) (head related transfer functions) are produced from HRTF (308) multichannel signal, using parametre (306) of level, having information on ratio of levels between two channels of multichannel signal so that modified HRTF (310) is more influenced by HRTF (308) of channel having higher level than HRTF (308) of channel, having lower level. Modified HRTF (310) are produced in process of decoding with accounting of relative level of channels related to these HRTF (308). Therefore, HRTF (308) are modified so that signal (314) of step-down mixing of parametric representation of multichannel signal could be used directly for synthesis of signal (314) of step-down mixing for headphones without necessity in full parametric multichannel recovery of parametric signal of step-down mixing.EFFECT: improved accuracy of reproduction of multichannel audio signals.26 cl, 11 dwg

Data signal encoding // 2407145
FIELD: information technology.SUBSTANCE: very crude quantisation which exceeds a measure defined by a masking threshold without or only with very small quality losses is provided by quantisation of not a directly pre-filtered signal, but prediction errors obtained in accordance with adaptive prediction ahead the pre-filtered signal.EFFECT: due to the adaptability applied ahead, the quantisation error does not have negative effect on prediction on the side of the decoder.49 cl, 10 dwg

ultichannel audio encoding // 2407073
FIELD: information technology.SUBSTANCE: device for encoding N audio signals into M audio signals and associated parametric data N>M, M≥1 is designed. A multichannel audio encoding device (10) has a first and a second encoding unit (110, 120). The first unit (110) encodes a multichannel audio signal (101) into spatial information (102) and first associated parametric data (104), which enable a mutichannel decoding device (20) to reconstruct the multichannel audio signal (203) into spatial information (102). The second unit (120) generates second associated parametric data (105) from the spatial information (102), where said second associated parametric data enable the decoding device to reconstruct spatial information (202) from alternative information (103), for example art information, which can be mixed in an audio studio. In the decoding device (20), spatial information (202) is reconstructed from alternative information (103) and second associated parametric data (105), and the spatial information (202) is then decoded to obtain a multichannel audio signal (203).EFFECT: high quality of reconstructed multichannel signal.23 cl, 6 dwg

Decoding of reduced number of channels // 2406262
FIELD: information technologies.SUBSTANCE: intermediate presentation of multi-channel signal channels is restored, when mixing parametres are calculated with increase of channels number for mixing with increase of number of channels of transmitted signal mixed with reduction of number of channels, into intermediate presentation of channels, which makes it possible to execute mixing with increase of channels number using the same mixing algorithms with increased number of channels, as well as during multi-channel restoration. This is achieved using facility of parametres recalculation for calculation of mixing parametres with increase of channels number, in which parametres containing information on channels that are not included in intermediate presentation of channels are also taken into account.EFFECT: decoding of signal with high efficiency and high fidelity of reproduction.23 cl, 8 dwg

Improved method for signal generation in restoration of multichannel audio // 2393646
FIELD: information technologies.SUBSTANCE: restored output channel is used, which is restored by multi-channel restoration unit, using at least one channel of step-down mixing, produced by means of step-down mixing of multiple initial channels and using parametric representation including additional information related to time detailed structure of initial channel, may be generated using generator (32) to form component (42) of direct signal and component (44) of diffuse signal on the basis of channel (38) of step-down mixing. Only component (42) of direct signal is modified (34) so that time (40) thin structure of restored output channel (50) on the basis of unitor (36) of modified component (46) of direct signal and component (44) of diffuse signal is matched with desirable time thin structure specified by means of additional information related to transmitted time thin structure.EFFECT: improved accuracy of restoration of multi-channel audio channel.30 cl, 7 dwg
 
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