ECHO SUPPRESSOR AND ECHO SUPPRESSION METHOD

Japanese Patent JP2014230017

A

PROBLEM TO BE SOLVED: To allow for appropriate suppression of the echo components depending on the environment, by taking account of the reverberation time of each frequency band.SOLUTION: An echo suppressor includes an echo transmission characteristics estimation unit (14) for estimating the transmission characteristics of an echo signal from the power spectrum of a received signal and the power spectrum of a sound collection signal, an echo signal power spectrum estimation unit (15) for estimating the power spectrum of an echo signal on the basis of the transmission characteristics of the echo signal and the power spectrum of a received signal, and an echo suppression gain calculation unit (16) for calculating the echo suppression gain from the echo signal power spectrum and the power spectrum of a sound collection signal. The echo signal power spectrum estimation unit (15) sets an oblivion coefficient for each frequency band from the reverberation time for each frequency band, and estimates the power spectrum of an echo signal while taking account of the power spectrum of an echo signal in the past, by using the oblivion coefficient thus set.

SETO MIKIO
ICHIKAWA TAKUTO
SATO SUMIO
HATTORI NAGAO
SUENAGA TAKEAKI

JP2013106839A

December 08, 2014

May 21, 2013

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SHARP KK

H04B3/20; H04M1/60

JP2012189907A	2012-10-04
JP2010045804A	2010-02-25
JP2008259032A	2008-10-23
JP2011254420A	2011-12-15

WO2012055687A1

2012-05-03

阪内澄宇　他: "STSA推定に基づくエコー抑圧処理のゲイン強調化方式", 電子情報通信学会論文誌, vol. 基礎・境界 J88-A(6), JPN6017004917, 1 June 2005 (2005-06-01), JP, pages 695 - 703, ISSN: 0003499985

Hiroyuki Okada
Kenji Tsuboi
Ken-ichiro Sano

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