Robust double-talk detection

Details Robust double-talk detection Robust double-talk detection

1994-09-22

1997-02-11

Zele, Krista M.

Telephonic communications

Echo cancellation or suppression

379410, 379411, 379 59, 379 60, H04M 158

Patent

active

056029136

ABSTRACT:
A device and method for detecting and suppressing double-talk in a cellular mobile unit employ a cellular transceiver; a receive signal path; a transmit signal path; and a double-talk detector. The double-talk detector determines a receive slope of a receive signal, and determines a transmit slope of a transmit signal. The double-talk detector further determines a difference slope of a difference signal that is determined by evaluating differences between the receive signal and the transmit signal. Finally, the double-talk detector generates a double-talk flag signal in the event the transmit slope indicates an increasing transmit speech power, and the receive slope and the difference slope indicate a prescribed relationship between the changes in the receive speech power and the difference power.

REFERENCES:
patent: 5014263 (1991-05-01), Vairavan et al.
patent: 5263079 (1993-11-01), Umemoto
patent: 5278900 (1994-01-01), Van Gerwen et al.
patent: 5353348 (1994-10-01), Sendyk et al.
patent: 5390250 (1995-02-01), Janse et al.

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