Multifrequency signal parity detector

Details Multifrequency signal parity detector Multifrequency signal parity detector

1975-12-29

1977-04-19

Cooper, William C.

H04M 150

Patent

active

040189910

ABSTRACT:
A parity checking circuit for use in multifrequency tone receivers is disclosed wherein associated receivers are made less susceptible to digit simulation when talking is present, by verifying that the same two tones are present for the entire parity timing period.

REFERENCES:
patent: 3128349 (1964-04-01), Boesch
patent: 3140357 (1964-07-01), Bischof
patent: 3288940 (1966-11-01), Bennett
patent: 3916115 (1975-10-01), Tarr

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