A coustic echo canceller with multiple echo paths

Nobuo Koizumi, Shoji Makino, Hiroshi Oikawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


A new configuration of acoustic echo canceller for multiple microphone teleconferencing systems is proposed. It is designed for use with microphones whose gains switch or vary during teleconferencing according to the talker. This system requires memory for multiple echo paths, which enables the updating of filter coefficients when an echo path is changed due to the switching of the actuated microphone during talker alternation. In comparison to the single echo path model which uses only adaptation, this method maintains echo cancellation during abrupt changes of the echo path when the microphone alternates between talkers. Also in comparison to direct microphone output mixing, this method reduces the stationary residual echo level by the reduction of acoustic coupling.

Original languageEnglish
Pages (from-to)39-45
Number of pages7
JournalJournal of the Acoustical Society of Japan (E)
Issue number1
Publication statusPublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


Dive into the research topics of 'A coustic echo canceller with multiple echo paths'. Together they form a unique fingerprint.

Cite this