Speakerphone linear comparator

Details Speakerphone linear comparator Speakerphone linear comparator

1983-08-11

1985-01-08

Brown, Thomas W.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

179100L, 307362, 307355, 307356, 330 69, 330252, 330288, H04M 908

Patent

active

044928246

ABSTRACT:
There is disclosed a precision linear comparator for a speakerphone circuit having two rectifying constant voltage nodes for separately summing two groups of signals derived from a speakerphone transmit channel and receive channel and supplying at an output terminal a signal representative of the difference between two unblocked summed signals. Each node blocks its summed signal if the signal is not representative of a true voice signal. A null signal is supplied at the output terminal during the absence of unblocked summed signals.

REFERENCES:
patent: 3171901 (1965-03-01), Clemency et al.
patent: 3751602 (1973-08-01), Breeden
patent: 3889059 (1975-06-01), Thompson et al.
patent: 3963868 (1976-06-01), Randmere et al.
patent: 4002854 (1977-01-01), Penrose
patent: 4317959 (1982-03-01), Kuriki
"Fundamental Considerations in the Design of Voice Switched Speakerphone", A. Busala, Bell System Technical Journal, Mar. 1960, vol. 39, pp. 265-294.

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