EP2987339B1 - Procédé de restitution sonore d'un signal numérique audio - Google Patents

Procédé de restitution sonore d'un signal numérique audio Download PDF

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Publication number
EP2987339B1
EP2987339B1 EP14721466.2A EP14721466A EP2987339B1 EP 2987339 B1 EP2987339 B1 EP 2987339B1 EP 14721466 A EP14721466 A EP 14721466A EP 2987339 B1 EP2987339 B1 EP 2987339B1
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EP
European Patent Office
Prior art keywords
frequency
sound
audio
digital
file
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Not-in-force
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EP14721466.2A
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German (de)
English (en)
French (fr)
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EP2987339A1 (fr
Inventor
Jean-Luc HAURAIS
Franck Rosset
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/04—Circuit arrangements, e.g. for selective connection of amplifier inputs/outputs to loudspeakers, for loudspeaker detection, or for adaptation of settings to personal preferences or hearing impairments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S5/00—Pseudo-stereo systems, e.g. in which additional channel signals are derived from monophonic signals by means of phase shifting, time delay or reverberation 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S3/00—Systems employing more than two channels, e.g. quadraphonic
    • H04S3/008—Systems employing more than two channels, e.g. quadraphonic in which the audio signals are in digital form, i.e. employing more than two discrete digital channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
    • H04S7/303—Tracking of listener position or orientation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2205/00—Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups
    • H04R2205/021—Aspects relating to docking-station type assemblies to obtain an acoustical effect, e.g. the type of connection to external loudspeakers or housings, frequency improvement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/01—Multi-channel, i.e. more than two input channels, sound reproduction with two speakers wherein the multi-channel information is substantially preserved
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/05—Generation or adaptation of centre channel in multi-channel audio systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/07—Generation or adaptation of the Low Frequency Effect [LFE] channel, e.g. distribution or signal processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/11—Positioning of individual sound objects, e.g. moving airplane, within a sound field
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S2400/00—Details of stereophonic systems covered by H04S but not provided for in its groups
    • H04S2400/15—Aspects of sound capture and related signal processing for recording or reproduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S7/00—Indicating arrangements; Control arrangements, e.g. balance control
    • H04S7/30—Control circuits for electronic adaptation of the sound field
    • H04S7/302—Electronic adaptation of stereophonic sound system to listener position or orientation
    • H04S7/303—Tracking of listener position or orientation
    • H04S7/304—For headphones

Definitions

  • the present invention relates to the field of processing audio signals to improve perception during sound reproduction.
  • the international patent application is known WO2012088336 describing a method of processing an audio sound source to create four dimensions of spatialized sound.
  • a virtual sound source can be moved along a path in a three-dimensional space over a specified period of time to obtain the location of the four-dimensional sound.
  • the various embodiments described herein provide methods and systems for the existing mono, 2-channel and / or multi-channel conversion of audio signals into spatialized audio signals having two or more audio channels.
  • the various embodiments also describe methods, systems, and apparatus for producing low frequency effects and center channel signals from incoming audio signals having one or more channels.
  • the European patent EP2119306 describes apparatus for processing an audio sound source to create four dimensions of spatialized sound.
  • a virtual sound source can be moved along a path in a three-dimensional space over a specified period of time to obtain the location of the four-dimensional sound.
  • a binaural filter for a desired spatial point is applied to the audio waveform to produce a spatialized waveform that, when the spatialized waveform is played from a pair of speakers, the sound appears to come from the chosen point space instead of speakers.
  • a binaural filter for a point in space is simulated by interpolation of the nearest neighbor binaural filters selected from a plurality of predefined binaural filters.
  • the audio waveform can be numerically processed by overlapping data blocks using a short Fourier transformation time.
  • Localized sound can be processed later for Doppler shift and chamber simulation.
  • the present invention relates to a method for processing an original audio signal of Nx channels, N being greater than 1 and x being greater than or equal to 0, comprising a multichannel processing step of said input audio signal by a multichannel convolution with a predefined imprint, said imprint being elaborated by the capture of a reference sound by a set of speakers arranged in a reference space characterized in that it comprises an additional step of selecting at least one of a plurality of fingerprints previously developed in different sound contexts.
  • the patent application WO2012172264 discloses a method of processing an original audio signal of Nx channels, N being greater than 1 and x being greater than or equal to 0, comprising a multichannel processing step of said input audio signal by a multichannel convolution with a predefined imprint, said fingerprint being developed by the capture of a reference sound by a set of speakers arranged in a reference space characterized in that it comprises an additional step of selecting at least one of a plurality of fingerprints previously developed in different sound contexts.
  • the patent application WO9725834 proposes another method and device for processing multichannel audio signals, each channel corresponding to a loudspeaker arranged at a particular point in a room so as to give, via an audio headset, the impression that multiple speakers' ghosts 'are distributed in the room.
  • Heading Transfer Functions are selected by taking into consideration the height and azimuth of each speaker in relation to the listener.
  • Each channel is HRTF filtered so that when these channels are combined in the left and right channels and output by headphones, the listener feels that the sound actually comes from ghost speakers distributed in the virtual room.
  • HRTF coefficient sets entered in base data from a large number of individuals and the use of an optimal HRTF game for the listener provides listening impressions similar to those of an isolated listener listening to multiple high speakers distributed in the volume of a room.
  • Applying an HRTF function to the output of the right and left channels allows, in the case of listening to the headphones, to give the impression of listening without headphones.
  • the object of the present invention is to improve the perceived quality and in particular the extent of the spatialization, including with means of reproduction of average quality, such as docking stations of tablets or mobile phones ("docks"). ).
  • the invention relates, in its most general sense, to a method of sound reproduction of a digital audio signal, characterized in that an oversampling step consisting in producing from a sampled signal at a first time is carried out.
  • frequency F a signal sampled at a frequency NxF, where N corresponds to an integer greater than 1, and then to applying a convolution process on a first digital file sampled at a frequency NxF corresponding to the acquisition of the sound environment of a reference sound space, a second digital file sampled at an NxF frequency corresponding to the acquisition of the soundprint of a reference playback equipment, and third file digital sample sampled at an NxF frequency corresponding to the acquisition of an equalizer's audio fingerprint and a fourth file corresponding to said oversampled audio file, the resulting digital packets being then digitally converted to a digital sampling frequency F / M corresponding to the working frequency of the listening equipment.
  • the processing is based on a mathematical convolution operation, and uses several prerecorded audio samples of the impulse response of the modeled space as well as an equalizer and playback equipment.
  • the method comprises an additional step of recalculating the file corresponding to said sound footprint of the reference sound space, in order to modify the balance between the spatial channels of said sound footprint.
  • the treatment method according to the invention consists in producing different acoustic impressions of a sound source, with a view to convolving these different sound tracks.
  • convolutions are a known technique of user capture, then the reproduction of the acoustic behavior of a place or an apparatus.
  • convolution reverbs allow to propose to use the acoustics of many real places, famous concert halls or others: these acoustics, previously sampled, likely to be reused at will within the program.
  • the principle is then to sample the acoustics of the sets in which the scenes of the film have been shot, in order to be able to easily apply this acoustics to the elements recorded a posteriori so that they fit perfectly to the sounds from the direct shots. .
  • the Impulse Response sensor to obtain the impulse response of a material or room constituting the sound footprint is based on the "deconvolution". It uses the excitation of the system by a known signal (here called f (t)). This signal is such that if we apply a transform (deconvolution function), the result is the Dirac function.
  • the types of signals used to capture impulse responses look like a Gaussian noise or a "white noise”.
  • the excitation sequences are generated by a deterministic algorithm and are periodic (periods of the order of a few seconds or tens of seconds for our application) and constitute a pseudo-random signal.
  • LFSRs linear feedback shift registers
  • This register structure whose order is determined by the number of registers, is such that over its period it will produce the set of possible binary values for its order (if order 4 structure, there are 2 n possible values) .
  • MLS, Maximum Length Sequence the longest possible sequence of binary numbers without repeating the same value twice.
  • the initial popularity of MLS stems from the ease of the deconvolution process.
  • the signal MLS is such that for its deconvolution, one can use a transform called Hadamard transform, which simplifies the calculations and has the advantage of being computationally computationally using few resources.
  • the first uses the passage in the frequency domain to make the calculations before returning to time.
  • Each of these impulse responses is captured from a reference signal at a high sampling rate, which is higher than the nominal sampling frequency of the playback equipment.
  • the hallmark (3) is acquired from a white noise producing a file of 6 Mbytes per speaker, for a long time greater than 500 milliseconds, preferably between one and two seconds.
  • the file corresponding to the impulse response is then compressed without loss (ZIP compression for example) and encrypted.
  • the footprint of the headphones (1) is acquired in the same way with a white or pink signal of a duration of about 200 milliseconds, preferably between 100 and 500 milliseconds.
  • the imprint of the equalizer (2) is acquired in the same way with a white or pink signal with a duration of about 200 milliseconds, advantageously between 100 and 500 milliseconds for each of the equalizer settings.
  • This function can be controlled by the gyro sensor to create a dynamic displacement of the sound scene according to the user's movements

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Stereophonic System (AREA)
EP14721466.2A 2013-04-17 2014-04-09 Procédé de restitution sonore d'un signal numérique audio Not-in-force EP2987339B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1353473A FR3004883B1 (fr) 2013-04-17 2013-04-17 Procede de restitution sonore d'un signal numerique audio
PCT/FR2014/050846 WO2014170580A1 (fr) 2013-04-17 2014-04-09 Procédé de restitution sonore d'un signal numérique audio

Publications (2)

Publication Number Publication Date
EP2987339A1 EP2987339A1 (fr) 2016-02-24
EP2987339B1 true EP2987339B1 (fr) 2017-07-12

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP14721466.2A Not-in-force EP2987339B1 (fr) 2013-04-17 2014-04-09 Procédé de restitution sonore d'un signal numérique audio

Country Status (7)

Country Link
US (1) US9609454B2 (ja)
EP (1) EP2987339B1 (ja)
JP (1) JP6438004B2 (ja)
CN (1) CN105308989B (ja)
CA (1) CA2909580A1 (ja)
FR (1) FR3004883B1 (ja)
WO (1) WO2014170580A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA3007629A1 (en) 2015-12-14 2017-06-22 Red.Com, Llc Modular digital camera and cellular phone

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0593228B1 (en) * 1992-10-13 2000-01-05 Matsushita Electric Industrial Co., Ltd. Sound environment simulator and a method of analyzing a sound space
JPH08191225A (ja) * 1995-01-09 1996-07-23 Matsushita Electric Ind Co Ltd 音場再生装置
AU1527197A (en) 1996-01-04 1997-08-01 Virtual Listening Systems, Inc. Method and device for processing a multi-channel signal for use with a headphone
EP1025743B1 (en) 1997-09-16 2013-06-19 Dolby Laboratories Licensing Corporation Utilisation of filtering effects in stereo headphone devices to enhance spatialization of source around a listener
JP2001224100A (ja) * 2000-02-14 2001-08-17 Pioneer Electronic Corp 自動音場補正システム及び音場補正方法
JP2005217837A (ja) * 2004-01-30 2005-08-11 Sony Corp サンプリングレート変換装置およびその方法、並びに、オーディオ装置
GB0419346D0 (en) * 2004-09-01 2004-09-29 Smyth Stephen M F Method and apparatus for improved headphone virtualisation
WO2008106680A2 (en) 2007-03-01 2008-09-04 Jerry Mahabub Audio spatialization and environment simulation
GB2467534B (en) * 2009-02-04 2014-12-24 Richard Furse Sound system
EP2656640A2 (en) 2010-12-22 2013-10-30 Genaudio, Inc. Audio spatialization and environment simulation
FR2976759B1 (fr) 2011-06-16 2013-08-09 Jean Luc Haurais Procede de traitement d'un signal audio pour une restitution amelioree.

Also Published As

Publication number Publication date
US9609454B2 (en) 2017-03-28
CN105308989B (zh) 2017-06-20
US20160080882A1 (en) 2016-03-17
EP2987339A1 (fr) 2016-02-24
FR3004883B1 (fr) 2015-04-03
FR3004883A1 (fr) 2014-10-24
CA2909580A1 (fr) 2014-10-23
JP6438004B2 (ja) 2018-12-12
JP2016519526A (ja) 2016-06-30
CN105308989A (zh) 2016-02-03
WO2014170580A1 (fr) 2014-10-23

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