Carrier wave reproducing circuit in synchronized detection syste

Details Carrier wave reproducing circuit in synchronized detection syste Carrier wave reproducing circuit in synchronized detection syste

1982-01-05

1985-05-14

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 17, 331 23, 331 25, 455260, 455265, 358281, 329 50, 329122, H03L 708, H03D 300, H04N 140

Patent

active

045175314

ABSTRACT:
A modulated signal level detecting circuit comprising a synchronized detector 1 of the modulated input signal, a phase-locked loop 5, 14, 16 connected to the input signal for providing a reproduced carrier wave of the input signal, a switch 21 included in the phase-locked loop, and a signal level detecting circuit 22, 23 for detecting the level of the unmodulated signal and opening the switch and thereby breaking the loop when this level exceeds a fixed limit.

REFERENCES:
patent: 4130839 (1978-12-01), McCullough
patent: 4313139 (1982-01-01), Logie

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