Digital tone decoder

Details Digital tone decoder Digital tone decoder

1975-12-17

1977-12-06

Cooper, William C.

H04M 150

Patent

active

040618854

ABSTRACT:
A digital tone decoder includes means for generating a timing signal, zero crossing counter means for generating a decode signal after a predetermined number of zero crossings in response to an incoming time domain signal and for generating a reset signal at a predetermined time after the decode signal is sent to reset said zero crossing counter means to zero, and decoder means coupled to said zero crossing counter and to said timing means for generating an output signal at one of a plurality of output terminals corresponding to the frequency of the incoming signal upon receipt of the decode signal from said zero crossing counter means, said decoder means being reset to an initial state upon receipt of the reset signal.

REFERENCES:
patent: 3537001 (1970-10-01), Friend
patent: 3559080 (1971-01-01), Kobori
patent: 3727079 (1973-04-01), Garrett
patent: 3760269 (1973-09-01), Beeman
patent: 3790720 (1974-02-01), Schartmann
patent: 3935395 (1976-01-01), Ball
patent: 3949177 (1976-04-01), Ball

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