Noise chopper for preventing false locks in a coherent carrier r

Details Noise chopper for preventing false locks in a coherent carrier r Noise chopper for preventing false locks in a coherent carrier r

1979-12-26

1982-02-02

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329104, 329124, 331 12, 375 86, H03D 318

Patent

active

043142060

ABSTRACT:
A multiple phase shift keyed data coherent carrier recovery system wherein a coherent carrier tracking loop has attached thereto a signal generator for providing a signal with non-stationary zero-crossing times (e.g. a noise generator), which signal generator chops, or alters the phase of, signals within the loop to prevent the loop from locking on harmonics or subharmonics and to allow AC coupling with DC response therein.

REFERENCES:
patent: 4017798 (1977-04-01), Gordy et al.
patent: 4085378 (1978-04-01), Ryan et al.
patent: 4157514 (1979-06-01), Naito et al.
patent: 4167027 (1979-09-01), Hashimoto

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