Audio signal processor and method therefor for substantially red

Details Audio signal processor and method therefor for substantially red Audio signal processor and method therefor for substantially red

1994-04-29

1997-09-16

Zele, Krista M.

Telephonic communications

Echo cancellation or suppression

379390, 379409, 379410, H04M 908

Patent

active

056688717

ABSTRACT:
An audio signal processor (209) comprises a forward signal path (256) having a forward audio signal (257) coupled to a loudspeaker (203) for producing a first acoustic signal (263), and a reverse signal path (248) coupled to a microphone (201) for producing a reverse audio signal (243), wherein at least a portion of the first acoustic signal (263) is coupled to the microphone (201) for producing a feedback audio signal (337) on the reverse signal path (248). An attenuator (305), coupled to the microphone (201), attenuates the reverse audio signal (243) responsive to a measure of the feedback audio signal (339). The measure of the feedback audio signal (339) preferrably comprises a signal to noise ratio measurement of the feedback audio signal (337). The attenuator (305) is further responsive to at least one of the first audio signal (257), and a third audio signal (239) which may also be coupled to the reverse signal path (248). The [present invention] audio signal processor (209) advantageously reduces audio feedback in a digital radiotelephone system (102) where audio processing times are long.

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