Method and apparatus for active reduction of speakerphone...

Details Method and apparatus for active reduction of speakerphone... Method and apparatus for active reduction of speakerphone...

2007-07-30

2011-10-25

Tsang, Fan (Department: 2614)

Telephonic communications

Substation or terminal circuitry

For loudspeaking terminal

C379S406080, C381S066000, C435S197000

Reexamination Certificate

active

08045701

ABSTRACT:
In a speakerphone device identification of signals (i.e., voice input or speaker output) in a process for reducing acoustic feedback, in a communication device, is accomplished by adding a signature noise (i.e., an identification mark) to output signals radiated by the speaker to enable these signals to be separated from speech input to the microphone. Having identified the signal (i.e., speech output) likely to cause a “singing” phenomenon, appropriate insertion loss to reduce the feedback may be added to the appropriate speech path within the communication device, to reduce a probability of singing.

REFERENCES:
patent: 5248604 (1993-09-01), Fischer
patent: 5428604 (1995-06-01), Fuda
patent: 5646990 (1997-07-01), Li
patent: 6301364 (2001-10-01), Lowmiller et al.
patent: 7054438 (2006-05-01), Erving et al.
patent: 7062039 (2006-06-01), Rasmusson

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