Communication device

Details Communication device Communication device

1990-01-30

1991-12-17

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

329315, 329347, 375 80, 455205, 455334, H04L 2730

Patent

active

050738984

ABSTRACT:
A signal processing circuit utilizes a convolver correlating a reference carrier signal with a received signal. The correlator output is detected and then demodulated to output the signal information originally present on the carrier. For a conventional AM signal the reference carrier signal is applied at a frequency offset from the AM center frequency. When the carrier is an FM signal, the reference signal is applied at a frequency equal to the center frequency of the FM signal. Similar procedures are followed for a spread-modulated AM signal, and the reference signal is modulated with a suitably timed-reverse replica of the pseudo-noise code. A similar procedure is used to process spread-spectrum frequency shift keyed FM signals.

REFERENCES:
patent: 4179658 (1979-12-01), Bitzer
patent: 4255810 (1981-03-01), Solomon et al.
patent: 4860307 (1989-08-01), Nakayama
patent: 4884284 (1989-11-01), Nakayama
patent: 4926440 (1990-05-01), Mikoshiba et al.

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