US 12,490,024 B2
Echo suppressing device, echo suppressing method, and non-transitory computer readable recording medium storing echo suppressing program
Yoshifumi Hirose, Kyoto (JP); and Shinichi Yuzuriha, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA, Torrance, CA (US)
Filed by Panasonic Intellectual Property Corporation of America, Torrance, CA (US)
Filed on Sep. 14, 2023, as Appl. No. 18/368,344.
Application 18/368,344 is a continuation of application No. PCT/JP2021/041796, filed on Nov. 12, 2021.
Claims priority of application No. 2021-042592 (JP), filed on Mar. 16, 2021.
Prior Publication US 2024/0007789 A1, Jan. 4, 2024
Int. Cl. H04R 3/02 (2006.01)
CPC H04R 3/02 (2013.01) 14 Claims
OG exemplary drawing
 
1. An echo suppressing device comprising:
a first linear echo suppression unit that estimates an amplitude component and a phase component of a linear echo signal included in an input signal acquired by a microphone to suppress the linear echo signal from the input signal;
a spectrum envelope extraction unit that extracts spectrum envelope information from at least one of a reception signal to be output to a loudspeaker, the input signal, and an output signal of the first linear echo suppression unit;
a nonlinear echo estimation unit that estimates spectrum envelope information of a nonlinear echo signal included in the input signal from at least one of spectrum envelope information extracted from the reception signal, spectrum envelope information extracted from the input signal, and spectrum envelope information extracted from the output signal of the first linear echo suppression unit; and
a nonlinear echo suppression unit that suppresses the nonlinear echo signal from the output signal of the first linear echo suppression unit by using the spectrum envelope information of the nonlinear echo signal estimated by the nonlinear echo estimation unit.