Abstract: The processing of a signal y(t) coming from a microphone of an equipment item including a loudspeaker intended to be supplied a signal x(t), limits an echo effect induced by the microphone capturing a sound emitted by the loudspeaker. This sound and any of its acoustic reflections follow an acoustic path w from the loudspeaker to the microphone. To limit the echo effect, the processing includes determining ?(t) a useful signal s(t) by subtracting from the signal y(t) an estimate of an echo signal x(t)*?(t) given by applying a filter ?(t) to the signal x(t). The filter ?(t) is adaptive by variable step size to account for a change over time in the acoustic path w(t). The adaptive filter ?(t) is produced at each frame k of samples as a function of an update ?W(k) to the acoustic path w for this frame k and by applying a normalization ? satisfying a criterion chosen for minimal variance.

Abstract: A method for calibrating a distributed audio reproduction system, including a set of N heterogeneous loudspeakers controlled by a server. This method includes the following steps: a) placing a microphone in front of a first loudspeaker of the set; b) capturing), by the microphone, a calibration signal sent to the loudspeaker at a first time and reproduced by same; c) capturing, by the microphone, the calibration signal sent with a known time delay to the N?1 other loudspeakers of the set and reproduced by these N?1 loudspeakers; d) capturing, by the microphone, the calibration signal sent to the first loudspeaker at a second time and reproduced again by same; e) repeating steps a) to d) for the N loudspeakers of the set; f) determining a plurality of heterogeneity factors to be corrected for the set of N loudspeakers by analysing the data thus captured; g) correcting the determined heterogeneity factors.

Abstract: A method for calibrating a distributed audio reproduction system, including a set of N heterogeneous loudspeakers controlled by a server. This method includes the following steps: a) placing a microphone in front of a first loudspeaker of the set; b) capturing), by the microphone, a calibration signal sent to tile loudspeaker at a first time and reproduced by same; c) capturing, by the microphone, the calibration signal sent with a known time delay to the N?1 other loudspeakers of the set and reproduced by these N?1 loudspeakers; d) capturing, by the microphone, the calibration signal sent to the first loudspeaker at a second time and reproduced again by same; e) repeating steps a) to d) for the N loudspeakers of the set; f) determining a plurality of heterogeneity factors to be corrected for the set of N loudspeakers by analysing the data thus captured; g) correcting the determined heterogeneity factors.

Abstract: A method for processing a monophonic signal in a 3D audio decoder, including processing binauralizing decoded signals intended to be delivered spatially by a headset. The method is such that, on detection, in a datastream representative of the monophonic signal, of an indication of non-binauralization processing, which indication is associated with spatial delivery position information, the decoded monophonic signal is directed to a stereophonic rendering engine, which takes into account the position information to construct two delivery channels that are directly processed via a direct mixing that sums these two channels with a binauralized signal output from the binauralization processing, in order to be delivered via the headset. A decoder device that implements the processing method is also provided.

Abstract: A method for selecting at least one image portion to be downloaded anticipatorily in order to render an audiovisual stream by a rendering device. The method includes: determining the location of a sound source in a spatialized audio component of the audiovisual content, determining a future observation direction on the basis of the determined location, selecting at least one portion of the image on the basis of the determined future observation direction, and downloading the at least one selected image portion.

Abstract: A method for processing a monophonic signal in a 3D audio decoder, including processing binauralizing decoded signals intended to be delivered spatially by a headset. The method is such that, on detection, in a datastream representative of the monophonic signal, of an indication of non-binauralization processing, which indication is associated with spatial delivery position information, the decoded monophonic signal is directed to a stereophonic rendering engine, which takes into account the position information to construct two delivery channels that are directly processed via a direct mixing that sums these two channels with a binauralized signal output from the binauralization processing, in order to be delivered via the headset. A decoder device that implements the processing method is also provided.

Abstract: A method for selecting at least one image portion to be downloaded anticipatorily in order to render an audiovisual stream by a rendering device. The method includes: determining the location of a sound source in a spatialized audio component of the audiovisual content, determining a future observation direction on the basis of the determined location, selecting at least one portion of the image on the basis of the determined future observation direction, and downloading the at least one selected image portion.

Abstract: A method of sound spatialization, in which at least one filtering process, including summation, is applied, to at least two input signals, the filtering process comprising: the application of at least one first room effect transfer function, the first transfer function being specific to each input signal, and the application of at least one second room effect transfer function, the second transfer function being common to all input signals. The method is such that it comprises a step of weighting at least one input signal with a weighting factor, said weighting factor being specific to each of the input signals.

Abstract: A method and apparatus are provided for processing data for estimating mixing parameters of at least one audio spot signal captured by a sound recording device, called a spot microphone, arranged in the vicinity of a source among a plurality of acoustic sources constituting a sound scene, and a primary audio signal captured by an ambisonic sound recording device, arranged to capture said plurality of acoustic sources of the sound scene.

Abstract: A sound spatialization, with the application of at least one transfer function with room effect to at least one sound signal. This application amounts to multiplying, in the spectral range, spectral components of the sound signal by the spectral components of a filter corresponding to the transfer function, each spectral component of the filter having a temporal evolution in a time-frequency representation. In particular, the spectral components of the filter are especially ignored, for the above-mentioned multiplications of components, beyond a threshold frequency and after at least a given instant in said time-frequency representation.

Abstract: A method and apparatus are provided for processing data for estimating mixing parameters of at least one audio spot signal captured by a sound recording device, called a spot microphone, arranged in the vicinity of a source among a plurality of acoustic sources constituting a sound scene, and a primary audio signal captured by an ambisonic sound recording device, arranged to capture said plurality of acoustic sources of the sound scene.

Abstract: A sound spatialization, with the application of at least one transfer function with room effect to at least one sound signal. This application amounts to multiplying, in the spectral range, spectral components of the sound signal by the spectral components of a filter corresponding to the transfer function, each spectral component of the filter having a temporal evolution in a time-frequency representation. In particular, the spectral components of the filter are especially ignored, for the above-mentioned multiplications of components, beyond a threshold frequency and after at least a given instant in said time-frequency representation.

Abstract: A method of sound spatialization, in which at least one filtering process, including summation, is applied, to at least two input signals, the filtering process comprising: the application of at least one first room effect transfer function, the first transfer function being specific to each input signal, and the application of at least one second room effect transfer function, the second transfer function being common to all input signals. The method is such that it comprises a step of weighting at least one input signal with a weighting factor, said weighting factor being specific to each of the input signals.

Abstract: Processing of sound data encoded in a sub-band domain, for dual-channel playback of binaural or Transaural® type is provided, in which a matrix filtering is applied so as to pass from a sound representation with N channels with N>0, to a dual-channel representation. This sound representation with N channels comprises considering N virtual loudspeakers surrounding the head of a listener, and, for each virtual loudspeaker of at least some of the loudspeakers: a first transfer function specific to an ipsilateral path from the loudspeaker to a first ear of the listener, facing the loudspeaker, and a second transfer function specific to a contralateral path from said loudspeaker to the second ear of the listener, masked from the loudspeaker by the listener's head. The matrix filtering comprises a multiplicative coefficient defined by the spectrum, in the sub-band domain, of the second transfer function deconvolved with the first transfer function.

Abstract: The invention relates to a method of tracking the position of the bust of a user on the basis of a video image stream, said bus comprising the user's torso and head, the method comprising the determination of the position of the torso on a first image, in which method a virtual reference frame is associated with the torso on said first image, and in which method, for a second image, a new position of the virtual reference frame is determined on said second image, and, a relative position of the head with respect to said new position of the virtual reference frame is measured by comparison with the position of the virtual reference frame on said first image, so as to determine independently the movements of the head and the torso.

Abstract: A conference bridge of a conference system having a plurality of conference stations, the bridge comprising: reception means for receiving dual-channel audio signals coming from the conference station; determination means for determining at least one processing function per conference station of the conference system; application means for applying respective weighing functions to the received dual-channel signals; build-up means for building up one hybrid dual-channel signal for forwarding per conference station by means for summing a portion of the process dual-channel audio signals; and forwarding means for forwarding the respective hybrid dual-channel audio signal to each of the various conference stations of the conference system. A method of forwarding a spatialized audio scene and implemented by a conference bridge is also disclosed.

Abstract: A method, implemented by electronic data processing resources, for audio conference between conference participants via their respective terminals, the participants including at least one listener and at least one speaker, the method comprising, for at least said listener and for at least said speaker, the steps consisting in, estimating, as a function of a digital signal coming from a terminal of the speaker, at least one characteristic specific to said speaker, and determining, using said at least one estimated characteristic, a setpoint for positioning the speaker within a virtual space of the listener.

Abstract: Processing of sound data encoded in a sub-band domain, for dual-channel playback of binaural or transaural® type is provided, in which a matrix filtering is applied so as to pass from a sound representation with N channels with N>0, to a dual-channel representation. This sound representation with N channels comprises considering N virtual loudspeakers surrounding the head of a listener, and, for each virtual loudspeaker of at least some of the loudspeakers: a first transfer function specific to an ipsilateral path from the loudspeaker to a first ear of the listener, facing the loudspeaker, and a second transfer function specific to a contralateral path from said loudspeaker to the second ear of the listener, masked from the loudspeaker by the listener's head. The matrix filtering comprises a multiplicative coefficient defined by the spectrum, in the sub-band domain, of the second transfer function deconvolved with the first transfer function.

Abstract: The invention concerns a process for joint synthesis and spatialization of multiple sound sources in associated spatial positions, including: a) a step of assigning to each source at least one parameter (pi) representing an amplitude; b) a step of spatialization consisting in implementing an encoding into a plurality of channels, wherein each amplitude (pi) is duplicated to be multiplied to a specialization gain (gim), each spatialization gain being determined for one encoding channel (pgm) and for a source to be spatialized (Si); c) a step of grouping (R) the parameters multiplied by the gains (Pim), in respective channels (pg1, . . . , pgM), by applying a sum of said multiplied parameters (pim) on all the sources (Si) for each channel (pgm), and d) a step of parametric synthesis (SYNTH(I), . . . , SYNTH(M)) applied to each of the channels (pgm).

Abstract: The invention concerns a method for three-dimensional spatialization of audio channels from a filter BRIR incorporating a theater effect. For a specific number N of samples corresponding to the size of the pulse response of the BRIR filter, it consists in breaking down (A) the BRIR filter into at least a set of delay and amplitude values associated with the times of arrival of reflections; extracting (B) on the number of B samples at least one spectral module of the BRIR filter; and constituting (C) from each successive delay, its amplitude and its spectral module associated with an elementary BRIR filter (BRIRe) directly applied to the audio channels in the time, frequency or transformed domain. The invention is applicable to binaural or multichannel spatialization.