Device and method for linear listener echo cancellation

Details Device and method for linear listener echo cancellation Device and method for linear listener echo cancellation

1994-01-13

1995-04-11

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

379410, H04M 100

Patent

active

054065526

ABSTRACT:
A device and method utilize a linear feedback/feedforward configuration to estimate and cancel a listener echo wherein equalizer (202) and listener echo cancellation (204 and 208) units are jointly updated, allowing determination of an error signal (204 and 208), in place of the former method of separate error signal determination for each of an equalizer and a listener echo canceller. An improved phase-correction scheme is utilized to compensate the frequency offset in the listener echo. The relationship between the listener echo and talker far echo is utilized to facilitate the listener echo cancellation.

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patent: 5117418 (1992-05-01), Chaffee et al.
patent: 5132963 (1992-07-01), Ungerboeck
patent: 5189664 (1993-02-01), Cheng

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