Sub-miniature tone decoder

Details Sub-miniature tone decoder Sub-miniature tone decoder

1980-09-22

1983-01-18

Popek, Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

328 75, 455 38, H04M 150

Patent

active

043693385

ABSTRACT:
A tone decoder for the sixteen standard Bell System DTMF tone pairs is presented which is comprised of first and second tone detectors adapted to provide logic signals in response to detection of predetermined frequencies. The logic signals are processed by a counter which is incremented by simultaneous logic signals from the first and second tone detectors and which controls a switch adapted to change the frequencies to which the tone detectors are responsive.

REFERENCES:
patent: 3670242 (1972-06-01), McGarvey
patent: 3780230 (1973-12-01), Bowen et al.
patent: 4151472 (1979-04-01), Watanabe et al.

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