EP 3475943 B1 20211201 - METHOD FOR CONVERSION AND STEREOPHONIC ENCODING OF A THREE-DIMENSIONAL AUDIO SIGNAL
Title (en)
METHOD FOR CONVERSION AND STEREOPHONIC ENCODING OF A THREE-DIMENSIONAL AUDIO SIGNAL
Title (de)
VERFAHREN ZUR UMWANDLUNG UND STEREOPHONEN CODIERUNG EINES DREIDIMENSIONALEN AUDIOSIGNALS
Title (fr)
PROCEDE DE CONVERSION ET D'ENCODAGE STEREOPHONIQUE D'UN SIGNAL AUDIO TRIDIMENSIONNEL
Publication
Application
Priority
- MC 2624 A 20160930
- EP 2017025274 W 20170928
Abstract (en)
[origin: WO2018059742A1] The invention relates to a method for the conversion, encoding, decoding and transcoding of a sound field, especially a first-order Ambisonics three-dimensional sound field, including at least one method of converting said sound field into a spherical field, a method of encoding said spherical field into a stereophonic signal, a method of decoding a stereophonic signal to a spherical field, or a method of transcoding said spherical field to a randomly chosen audio format. According to the method of encoding the Ambisonics sound field into a spherical field, said sound field is separated, in the frequency domain, into three components, or optionally two components, and these components are recombined into a total spherical field. According to the method of encoding the spherical field into a stereophonic signal, in the frequency domain, the panning values and phase-difference values are determined, the singularity of the phase difference in the interchannel domain is determined, the phase correspondence function in the interchannel domain is determined, and the left-hand and right-hand components of the signal encoded into stereophonic form are calculated. The spherical coordinates are optionally subjected to affine modification such that they correspond to the standard geometric disposition of the left-hand and right-hand channels. The method of decoding into a spherical field is applied to any stereophonic signal, in particular a stereophonic signal obtained by the above encoding method. According to the aforementioned method of decoding into a spherical field, in the frequency domain, the panning and phase difference are determined, the new position of the phase difference singularity in the interchannel domain is determined, said position varying temporally, the phase correspondence function in the interchannel domain is determined, a complex coefficient corresponding to the desired spherical field is determined, and the direction of provenance in the spherical field is determined, said direction being optionally subject to affine modification in order to correspond to the standard geometric disposition of the left-hand and right-hand channels. The method of transcoding on the basis of a stereophonic signal comprises the above method of decoding to a spherical field, followed by a method ensuring that the spherical field is projected on a specified audio panning law or a binauralisation method.
IPC 8 full level
G10L 19/008 (2013.01); H04S 3/02 (2006.01); H04S 5/02 (2006.01)
CPC (source: EP US)
G10L 19/008 (2013.01 - EP US); G10L 19/02 (2013.01 - US); H04R 5/033 (2013.01 - US); H04R 5/04 (2013.01 - US); H04S 3/00 (2013.01 - US); H04S 3/02 (2013.01 - EP); H04S 5/02 (2013.01 - EP); H04S 2400/03 (2013.01 - EP); H04S 2420/01 (2013.01 - EP); H04S 2420/11 (2013.01 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
WO 2018059742 A1 20180405; CN 109791768 A 20190521; CN 109791768 B 20231107; EP 3475943 A1 20190501; EP 3475943 B1 20211201; MC 200186 B1 20171018; US 11232802 B2 20220125; US 2020168235 A1 20200528
DOCDB simple family (application)
EP 2017025274 W 20170928; CN 201780051834 A 20170928; EP 17787331 A 20170928; MC 2624 A 20160930; US 201716333433 A 20170928