Title:
【発明の名称】多チャンネルエコー除去方法および装置
Document Type and Number:
Japanese Patent JP2792311
Kind Code:
B2
Abstract:
A multi-channel echo canceller comprises a set of subtractors connected respectively in communication channels for respectively receiving a signal from a respective microphone and cancelling an echo contained in it with a cancelling signal, and a set of adaptive filters associated respectively with the subtractors. Each adaptive filter has a set of vectors of filter coefficients. A time difference between propagation delays of the received signals is estimated, and a signal having the largest content of echo components is selected and applied to the adaptive filters. One of the coefficient vectors is identified according to the estimated time difference and the selected signal. Each adaptive filter varies its filter coefficients of the identified vector with a correction term proportional to the output of the associated subtractor for filtering the selected signal using the coefficients of the identified vector to derive an echo replica, which is supplied to the associated subtractor as the cancelling signal.
Inventors:
HIRANO AKIHIRO
Application Number:
JP4618592A
Publication Date:
September 03, 1998
Filing Date:
January 31, 1992
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H04B3/23; H03H21/00; H04M9/08; (IPC1-7): H04B3/23; H03H21/00
Domestic Patent References:
| JP6197050A | ||||
| JP4284732A |
Other References:
１９９１年電子情報通信学会春季全国大会講演論文集，〔分冊１〕 （１９９１−３−１５） ＰＰ．１・２０２
１９９２年電子情報通信学会春季全国大会講演論文集，〔分冊１〕 （１９９２−３−１５） ＰＰ．１・１５８
電子情報通信学会技術研究報告ＣＳ８４−１７８，Ｖｏｌ．８４，Ｎｏ．３３０ （１９８５−３−２６） ＰＰ．７−１４
１９９２年電子情報通信学会春季全国大会講演論文集，〔分冊１〕 （１９９２−３−１５） ＰＰ．１・１５８
電子情報通信学会技術研究報告ＣＳ８４−１７８，Ｖｏｌ．８４，Ｎｏ．３３０ （１９８５−３−２６） ＰＰ．７−１４
Attorney, Agent or Firm:
Nobuo Takahashi (5 others)