Frequency discriminator for signal receiver of telecommunication

Details Frequency discriminator for signal receiver of telecommunication Frequency discriminator for signal receiver of telecommunication

1980-03-19

1982-04-13

Moore, David K.

328167, H03K 500, H03B 100, H03L 700

Patent

active

043250300

ABSTRACT:
A frequency discriminator designed to respond to a selected incoming tone frequency comprises a pulse generator connected via an adjustable frequency divider to a binary 8-stage counter which generates eight relatively staggered pulse trains whose cadence varies with the setting of the divider. This setting can be varied, e.g. in a programmed manner according to a pattern of tone frequencies to be recognized, while incoming signals are applied to an eight-path filter driven by the staggered pulse trains. When the cadence of the pulse trains matches an incoming tone frequency, the filter emits an output exceeding a predetermined threshold.

REFERENCES:
patent: 3731188 (1973-05-01), Smith
patent: 3812432 (1974-05-01), Hanson
patent: 3942126 (1976-03-01), Muraoka

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