US 12,143,799 B2
Acoustic signal encoding method, acoustic signal decoding method, program, encoding device, acoustic system, and decoding device
Masayuki Nishiguchi, Akita (JP); and Kodai Kato, Ibaraki (JP)
Assigned to AKITA PREFECTURAL UNIVERSITY, Akita (JP)
Appl. No. 17/432,098
Filed by AKITA PREFECTURAL UNIVERSITY, Akita (JP)
PCT Filed Feb. 18, 2020, PCT No. PCT/JP2020/006211
§ 371(c)(1), (2) Date Aug. 19, 2021,
PCT Pub. No. WO2020/171049, PCT Pub. Date Aug. 27, 2020.
Claims priority of application No. 2019-027035 (JP), filed on Feb. 19, 2019.
Prior Publication US 2023/0136085 A1, May 4, 2023
Int. Cl. H04S 7/00 (2006.01); H04R 5/02 (2006.01)
CPC H04S 7/301 (2013.01) [H04R 5/02 (2013.01); H04S 2420/01 (2013.01)] 25 Claims
OG exemplary drawing
 
1. An acoustic signal encoding method that encodes an acoustic signal of a plurality of channels and/or a plurality of sound source objects and that is executed by an encoding device, comprising the steps of:
calculating a masking threshold corresponding to a spatial masking effect of hearing;
determining an amount of information to be allocated to each of the plurality of channels and/or the plurailty of sound source objects by calculated masking threshold;
encoding the acoustic signal of the plurality of channels and/or the plurality of sound source objects by each of the allocated amount of information, wherein
the masking threshold is calculated corresponding to the spatial masking effect of hearing based on a spatial distance and/or direction between each of the plurality of channels and/or between each of the plurality of sound source objects, wherein
the masking threshold is calculated corresponding to the spatial masking effect of hearing such that,
for each of the plurality of channels and/or each of the plurality of sound source objects located at front-back symmetrical position with respect to a listener, a degree of mutual influence on the spatial distance and/or direction between each of the plurality of channels and/or each of the plurality of sound source objects is changed; wherein
the masking threshold is calculated corresponding to the spatial masking effect of hearing such that,
for a channel and/or sound source object behind the listener, a second channel and/or second sound source object is considered to exist, wherein the second channel and/or second sound source object considered to exist is the same as the channel and/or the sound source object behind the listener except that the second channel and/or the second sound source object is considered to be in front of the listener corresponding to a front-back symmetrical position relative to the channel and/or the sound source object behind the listener.