1983-02-18
1984-12-25
George, Keith E.
H04M 908, H04M 160
Patent
active
044905823
ABSTRACT:
There is disclosed a speakerphone circuit employing precision peak detectors in which the processing of talk down signals and switch guard signals is partitioned in order to accurately control complementary switched gain in the transmit and receive channels to achieve improved sensitivity to talk down switching action by setting a low switching threshold.
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"Fumdamental Considerations in the Design of Voiced Switched Speakerphone", A. Busala, Bell System Technical Journal, Mar. 1960, vol. 39, pp. 265-294.
AT&T Information Systems Inc.
George Keith E.
Luludis Frederick B.
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