Tone detector

Details Tone detector Tone detector

1976-05-17

1977-08-16

Claffy, Kathleen H.

H04M 150

Patent

active

040427889

ABSTRACT:
A digital tone detector is of the period detection type employing a digital counter which is stepped by means of a high speed clock. The counter is reset by zero-crossings of an analog tone signal. A set of period range decoder gates indicate the presence of any of a set of predetermined frequency tones. A .div. 4 counter is introduced between the terminal which receives the zero-crossing signal and the reset input of the counter. Sequence control circuits are provided to coordinate the timed relationship of readout and initiation of a new detection period such that the speed of response is minimally degraded by the .div. 4 counter.

REFERENCES:
patent: 3790720 (1974-02-01), Schartmann

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