US 11,990,149 B2
Echo suppression device, echo suppression method, and echo suppression program
Yuki Satomi, Yokohama (JP)
Assigned to TRANSTRON INC., Yokohama (JP)
Appl. No. 17/437,665
Filed by TRANSTRON INC., Yokohama (JP)
PCT Filed Mar. 17, 2020, PCT No. PCT/JP2020/011726
§ 371(c)(1), (2) Date Sep. 9, 2021,
PCT Pub. No. WO2020/203258, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-072738 (JP), filed on Apr. 5, 2019.
Prior Publication US 2022/0165286 A1, May 26, 2022
Int. Cl. H04B 15/00 (2006.01); G10L 21/0208 (2013.01); H04B 3/23 (2006.01)
CPC G10L 21/0208 (2013.01) [H04B 3/234 (2013.01); G10L 2021/02082 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An echo suppression device for suppressing an echo generated by inputting a voice signal output from a speaker to a microphone, the echo suppression device comprising:
a level adjustment unit provided on a receiving signal path for transmitting a signal of receiving signals from a far-end side to the speaker;
an echo removal unit provided on a transmitting signal path for transmitting a signal input from the microphone, the echo removal unit removing a residual echo from a picked-up sound signal output from the microphone; and
a double-talk detection unit that detects whether signals are in a double-talk state in which the signals are simultaneously transmitted to the transmitting signal path and the receiving signal path, wherein
the level adjustment unit includes a compressor, which, when the double-talk detection unit has detected the double-talk state, performs a compression process on a signal greater than a first threshold among the receiving signals.