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Mdct-based complex prediction stereo coding Invention relates to means of stereo encoding and decoding using complex prediction in the frequency domain. A decoding method for obtaining an output stereo signal from an input stereo signal encoded by complex prediction coding and comprising first frequency-domain representations of two input channels, comprises the upmixing steps of: (i) computing a second frequency-domain representation of a first input channel; and (ii) computing an output channel based on the first and second frequency-domain representations of the first input channel, the first frequency-domain representation of the second input channel and a complex prediction coefficient. |
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Surround sound system and method therefor 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. |
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Apparatus for generating output spatial multichannel audio signal Invention relates to means of generating an output spatial multichannel audio signal based on an input audio signal. The input audio signal is decomposed based on an input parameter to obtain a first signal component and a second signal component that are different from each other. The first signal component is rendered to obtain a first signal representation with a first semantic property and the second signal component is rendered to obtain a second signal representation with a second semantic property different from the first semantic property. The first and second signal representations are processed to obtain an output spatial multichannel audio signal. |
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Recording medium, playback device and integrated circuit Group of inventions relates to the technology of playing back stereoscopic video and particularly to selection of a video stream on a recording medium. The playback device for playing back video from a recording medium includes a reading unit configured to read a plurality of base-view stream file extents and dependent-view stream file extent after extent. The base-view stream file is used for monoscopic video playback, and the dependent-view stream file is used for stereoscopic video playback in combination with the base-view stream file. The recording medium has a stereoscopic/monoscopic common area, a stereoscopic special area and a monoscopic area. The stereoscopic/monoscopic common area is a continuous area in which a plurality of extents belonging to the base-view stream file and a plurality of extents belonging to the dependent-view stream file are recorded using an interleaving method, wherein the interleaved plurality of extents recorded in the stereoscopic/monoscopic common area are first extents. |
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Invention relates to means of encoding and decoding audio signals. A downmix signal and a residual signal are generated based on a stereo signal. The difference in intensity between channels and cross-correlation between channels are determined. Preferably, parametric stereo coding parameters are time- and frequency-dependent. A transform stage generates a pseudo left/right stereo signal by performing a transform based on the downmix signal and the residual signal. The pseudo stereo signal is processed by a perceptual stereo encoder. For stereo encoding, left/right encoding or mid/side encoding can be selected. Preferably, the selection between left/right stereo encoding and mid/side stereo encoding is time- and frequency-dependent. |
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Method and apparatus for reproducing three-dimensional ambient sound Method involves obtaining image depth information which indicates the distance between at least one object in an image signal and a reference location; obtaining sound depth information which indicates the distance between at least one sound object in the sound signal and the reference location, based on the image depth information; providing a sound perspective for at least one sound object based on the sound depth information. |
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Angle-dependent operating device or method for generating pseudo-stereophonic audio signal Invention relates to audio signals and devices or methods for generation, transmission, conversion and reproduction thereof. A monophonic audio signal of arbitrary directional characteristic is subjected to targeted propagation time difference (1210, 1211) and loudness corrections (derived from 1212 and 1213), while parameterising the angle phi (1205) included by the main axis (1203) and the direction of impingement of the sound source (1204), an imaginary left opening angle alpha (1206), and an imaginary right opening angle beta (1207), and the directional characteristic of the monophonic signal to be stereophonicised (represented in polar coordinates). The result is an M-signal and an S-signal allowing MS matrix formation (and thereby the stereophonic reproduction of the originally monophonic audio signal). |
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Binaural rendering of multi-channel audio signal 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 ( X d n , 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). |
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Apparatus and method of generating output audio signals using object based metadata 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. |
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Method of applying reverberation to an M-channel reduced input audio signal which indicates X separate audio channels. In response to spatial label parameters, which indicate a spatial image of the reduced input signal, Y discrete signals of the reverberated channel are generated, where each of the signals of the reverberated channel at a time t is a linear combination of a subset of values of X separate audio channels at time t. The Y discrete signals of the reverberated channel are generated using a premixing matrix containing time-variable coefficients which are determined in response to spatial label parameters. |
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Generation of binaural signals 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. |
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Apparatus for merging spatial audio streams 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. |
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Acoustic system has a sound signal source, an amplifier and an electroacoustic transducer in form of a resonator, having a housing, a line of loudspeaker heads connected to the resonator through support rings and spaced apart along the axis of the resonator, an acoustic reflector in form of a disc which is placed opposite the loudspeaker cones along the axis of the resonator through a rod. |
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Apparatus for determining converted spatial audio signal 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. |
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Apparatus for generating multichannel audio signal 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). |
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Display device with object-oriented 3-dimensional representation of sound origin coordinates Invention relates to a display device with object-oriented 3-dimensional representation of sound origin coordinates, wherein sounds are transmitted through a speaker lying in accordance with coordinates of an object in a matrix speaker system formed by a plurality of speakers lying behind the display device in cooperation with the behaviour of the object, the image of which is displayed on the screen of the display device. The display device with an object-oriented 3D representation of sound origin coordinates includes a centre channel decoder which receives an audio signal corresponding to a centre channel speaker among audio signals from a decoder of the surround speaker system and separates into sound sources from an object; a centre channel matrix for setting the coordinates of sound sources from the objects separated by the centre channel decoder; a matrix amplifier for amplifying an output sound of a speaker matching each coordinate value of the sound sources produced the object; and a plurality of speakers which are arranged in a matrix shape behind the display monitor, whereby sounds are output through the speakers corresponding to the coordinates of the objects displayed on the display monitor. |
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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. |
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Apparatus for providing a set of spatial indicators associated with an upmix audio signal, having more than two channels, based on a double-channel microphone signal, comprises a signal analyser and an additional spatial information generator. The signal analyser is configured to receive component energy information and direction information based on the double-channel microphone signal such that the component energy information describes an estimate of energy of the direct sound component of the double-channel microphone signal, and such that the direction information describes an estimate of the direction from which the direct sound component of the double-channel microphone signal arrives. The additional spatial information generator is configured to compare component energy information and direction information with spatial indicator information which describes the set of spatial indicators associated with an upmix audio signal, having more than two channels. |
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Surround sound virtualiser with dynamic range compression and method 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. |
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Improving audio signal of fm stereophonic radio receiver by using parametric stereophonic coding Apparatus includes a parametric stereophonic coding (PS) parameter estimation step. The parameter estimation step is configured to determine one or more parametric stereophonic coding parameters based on a stereophonic audio signal in a frequency-variant or frequency-invariant manner. Preferably, said PS parameters are time- and frequency-variant. Furthermore, the apparatus includes an upmix step. The upmix step is configured to generate an improved stereophonic signal based on a first audio signal and the one or more parametric stereophonic coding parameters. The first audio signal is obtained from the stereophonic audio signal, e.g. by a downmix operation at a downmix step. The PS parameter estimation step may be part of a PS encoder. The upmix step may be part of a PS decoder. |
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Method and apparatus for providing clear perceptible position for audio source in audio composition Apparatus includes: a means of processing a foreground signal in order to provide a perceptible foreground angle for the foreground signal; a means of processing a foreground signal in order to provide the desirable attenuation level for the foreground signal; a means of processing a background signal in order to provide a perceptible background angle for the background signal; a means of processing a background signal in order to provide the desirable attenuation level for the background signal, wherein the background signal is processed such that it sounds fuzzier than the foreground signal; and a means of merging the foreground signal and the background signal into an output audio source signal. |
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Improved reproduction of multiple audio channels 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. |
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Audio coding using step-up mixing 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. |
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Device for three-dimensional colour display of audio stereo signals Result is achieved by simplifying the composition of the device using three band-pass filters of audio frequency, introducing into each channel a binary code-to-brightness code converter and making matrix elements in screens from one corresponding emitting cell. |
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Device for extracting an ambient signal from an input audio signal comprises a gain determinator for determining a sequence of time-varying ambient signal gain values for a given frequency band of the time-frequency distribution of the input audio signal. The device comprises a weighter for weighting one of the sub-band signals representing the given frequency band of the time-frequency-domain representation with the time-varying gain values, to obtain a weighted sub-band signal. The gain determinator obtains one or more quantitative feature-values describing one or more features of the input audio signal and to provide the gain value as a function of the one or more quantitative feature values such that the gain values are quantitatively dependent on the quantitative values. The gain determinator determines the gain values such that ambient components have a greater value than non-ambient components in the weighted sub-band signal. |
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Stereophonic characteristic expansion is achieved in sound reproducing systems with at least two loudspeakers. The input stereo signal, which includes several frequency components, is accessed. The loudspeakers are closed to each other. The frequency band of the frequency components is decorrelated, for example, during stereo signal preprocessing. The stereophonic characteristic of the sound reproducing system is expanded based on the decorrelation. |
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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. |
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Device and method of generating multichannel signal, using voice signal processing Device for generating a multichannel signal (10) having a number of output channels greater than a number of input channels; a mixer is used for upmixing the input signal to form a direct channel signal and an ambience channel signal. A speech detector (18) is provided for detecting part of the input signal, the direct channel signal or the ambience channel signal in which speech portions occur. Based on this detection, a signal modifier (20) modifies the input signal or the ambience channel signal in order to attenuate speech portions in the ambience channel signal, whereas such speech portions in the direct channel signal are attenuated to a lesser extent or not at all. Loudspeaker signal outputting means (22) then map the direct channel signals and the ambience channel signals to loudspeaker signals which are associated to a defined reproduction scheme, such as, for example, a 5.1 scheme. |
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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. |
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Manipulation of sweet spot for multi-channel signal Device to modify a sweet spot of a spatial M-channel audio signal comprises a receiver (201) to receive an N-channel audio signal, N<M, a parametric facility (203) to detect spatial parameters of step-up mixing, connecting the N-channel audio signal with the spatial M-channel audio signal, a modifying facility (207) to modify the sweet spot of the spatial M-channel audio signal by modification of at least one of spatial parameters of step-up mixing; a facility of generation (205) to generate a spatial M-channel audio signal by step-up mixing of an N-channel audio signal using at least one modified spatial parameter of step-up mixing. |
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Multichannel audio signal encoding apparatus and method Apparatus for encoding a mutichannel audio signal has a multichannel audio signal receiver, having a first and a second audio signal from a first and a second microphone, a time difference module for determining time difference between the first and second audio signals by combining successive observations of cross-correlations between the first and second audio signals, wherein the cross-correlations are normalised to derive state probabilities accumulated using a Viterbi algorithm to achieve time difference with built-in hysteresis, and the Viterbi algorithm calculates the state probability for each given state in form of a combined contribution of all routes included in that state, a delay module for multichannel audio signal compensation by delaying the first or second audio signal in response to the time difference signal, a monophonic module for generating a monophonic signal by combining multichannel audio signal compensation channels, and a monophonic signal encoder. |
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User annunciation on microphone cover 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. |
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Signal processing method and apparatus 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. |
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Method and device to generate stereo signal with improved perception property Audio processor (2) generates a stereo signal (4; 50) with enhanced perceptual properties using a central signal (6a) and a side signal (6b). The central signal (6a) represents a sum, and the side signal (6b) is a difference of the initial left and right channels (40). The audio processor includes a decorrelator (8) to generate a decorrelated representation of a component of the central signal (82) and/or a decorrelated representation of a component of the side signal (84), a combiner of a signal (10; 46) to generate an optimised side signal (14; 90) by combination of the representation (70) of the side signal with the decorrelated representation of the side signal (84) and with the decorrelated representation of the central signal component (82) or with the central signal components and the decorrelated representation of the side signal component (84), and a central side step-up mixer (12; 48), designed to generate a stereo signal with enhanced perceptual properties with application of the central signal representation and optimised side signal. |
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Method and apparatus for generating a binaural audio signal 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 |
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Device and method to synthesise output signal 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. |
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Method of colour-rendering of audio stereo signals and device to this effect Invention relates to colour music appliances and may be used to convert two-channel stereophonic recording into colour images. This is achieved by reproducing stereo sound colour images onto flat-panel displays in series of the following operations: encoding sounds in nine ranges of audio frequency, accumulating codes by nine code storages, sending all codes from said storages into nine pulse amplifier units, their pulses being used to initiate two display matrix elements to emit for spectator to perceive with the help of separate vision-filed glasses. |
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Method and device for sound signal processing Method of sound signal processing includes receiving a mixed signal, containing at least one signal of an object and information on an object extracted during formation of a mixed signal, receiving information on integration for control of an object signal, formation of a single one from information on mixing and multi-channel information with application of information on an object and information on integration in compliance with an output mode, and if a mixing information is generated, formation of an output signal is carried out by application of mixing information to a mixed signal, where the mixed signal and output signal correspond to a monophonic signal, and where multi-channel information complies with information for decomposition of the mixed signal into many channel signals. |
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Apparatus and method for multichannel parametric conversion 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. |
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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. |
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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. |
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Method and system to align loudspeaker in room Method to balance a frequency characteristic of a loudspeaker located in a room includes a stage of a transfer function measurement in a position for listening (L) from an electric input of the first loudspeaker (L1) to a sound pressure in the listening position (LP) in the room, a stage of detection of a general transfer function (G), which represents a spatial average of a sound pressure level in the room developed by the first loudspeaker (L1), a stage to detect the upper gain limit (UGL) as the frequency function. Besides, the upper gain limit (UGL) is based on inversion of the general transfer function (G), a stage to detect a balancing filter (F), based on the transfer function inversion in the listening position (L). Besides, the balancing filter (F) gain is limited by the maximum gain in compliance with the upper gain limit (UGL), and a stage to detect the first loudspeaker (L1) in compliance with the balancing filter (F). |
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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. |
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Methods and devices to code and to decode audio signals based on objects 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. |
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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. |
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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. |
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Audio signal processing method and device 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. |
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Method and apparatus for improving audio playback 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. |
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Enhancing audio signal with remixing capability 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. |
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Generation of decorrelated signals In case of transition audio input signals, in multichannel audio reproduction, non-correlated output signals are generated from audio input signal so that audio input signal is mixed with representation of audio input signal, delayed from the time of delay so that in the first time interval the first output signal complies with audio input signal, and the second output signal complies with delayed representation of audio input signal, besides, in the second time interval the first output signal complies with delayed representation of audio input signal, and the second signal complies with audio input signal. |
Another patent 2513227.