High speed tone decoder utilizing a phase-locked loop

Oscillators – Automatic frequency stabilization using a phase or frequency... – With intermittent comparison controls

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Details

324 83R, 331 12, 331 64, H03B 304

Patent

active

040371719

ABSTRACT:
A narrow-band tone decoder has a controllable oscillator, connected in a fast-capture phase-locked loop, for generating a signal having a frequency determined by a control signal produced within the loop. A synchronous detector, which responds to an input signal of the tone decoder and to a signal from the controllable oscillator, produces a signal having a magnitude dependent upon the magnitudes of the input signal and of the signal from the controllable oscillator. A window comparator monitors the control signal within the loop for deciding when the generated signal is within a predetermined frequency range.

REFERENCES:
patent: 2930892 (1960-03-01), Palmer
patent: 3080533 (1963-03-01), Edwards
patent: 3199037 (1965-08-01), Graves
patent: 3336534 (1967-08-01), Gluth
patent: 3456196 (1969-07-01), Schneider
patent: 3801925 (1974-04-01), Parkyn
patent: 3922602 (1975-11-01), Lunquist
patent: 3952261 (1976-04-01), Hara et al.

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