Speakerphone linear comparator

Details Speakerphone linear comparator Speakerphone linear comparator

H - Electricity

04

M

379/81

H04M 1/60 (2006.01) H04M 9/10 (2006.01)

Patent

CA 1215796

- 11 - SPEAKERPHONE LINAR COMPARATOR Abstract of the Disclosure 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.

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