US 12,192,711 B2
Speaker calibration method, apparatus and program
Kazunori Kobayashi, Tokyo (JP); and Ryotaro Sato, Tokyo (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/921,555
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Jun. 4, 2020, PCT No. PCT/JP2020/022102
§ 371(c)(1), (2) Date Oct. 26, 2022,
PCT Pub. No. WO2021/245876, PCT Pub. Date Dec. 9, 2021.
Prior Publication US 2023/0171555 A1, Jun. 1, 2023
Int. Cl. H04R 29/00 (2006.01); H04R 1/40 (2006.01)
CPC H04R 29/001 (2013.01) [H04R 1/403 (2013.01); H04R 2201/40 (2013.01); H04R 2430/20 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method for speaker calibration, comprising:
a first filter processing step in which a first filtered signal is generated by filtering an input signal;
a first speaker processing step in which sound based on the first filtered signal is produced by a first speaker;
a second filter processing step in which a second filtered signal is generated by filtering the input signal;
a gain multiplication step in which a gain multiplied signal is generated by multiplying the second filtered signal by a gain;
a second speaker processing step in which sound based on the gain multiplied signal is produced by a second speaker; and
a gain control step in which the gain is controlled such that a root mean square of a collected sound signal collected by a microphone installed at a mute position is smaller than a root mean square of the collected sound without gain control, the mute position being a position at which the sound produced by the first speaker and the sound produced by the second speaker are to be muted.