Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent
1993-09-13
1994-06-21
Dwyer, James L.
Telephonic communications
Substation or terminal circuitry
Sidetone control or hybrid circuit
379388, 379389, 379390, 379206, 379201, 381 66, 381 94, H04M 908
Patent
active
053234596
ABSTRACT:
A multi-channel echo canceler for canceling echo generated as a result of propagation of 2-channel received signals, along a spatial acoustical path via a first and a second loudspeaker, from a transmitted signal containing a speech source signal received through a first and a second microphone and the echo. The echo canceler is capable of highly accurate delay time difference estimation and also of quick detection of the movement or change of the talker. Right after the movement or change of the talker, the filter coefficient set updating is stopped, or step size is updated. Deterioration of the echo cancellation performance does not occur that might otherwise result from delay of the detection of the movement or change of the talker or reduction of estimated delay time difference.
REFERENCES:
patent: 4712231 (1987-12-01), Julstrom
patent: 4715063 (1987-12-01), Haddad et al.
patent: 5131032 (1992-07-01), Esaki et al.
Dwyer James L.
NEC Corporation
Saint-Surin Jacques M.
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