Receiver for phase-shift modulated carrier signals

Details Receiver for phase-shift modulated carrier signals Receiver for phase-shift modulated carrier signals

1979-12-26

1981-11-03

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 97, 375119, 329124, H04L 2722, H04L 2706, H03D 322

Patent

active

042989868

ABSTRACT:
A receiver for recovering digital data from a phase-shift-modulated carrier in a data communications system, utilizes a relatively wide band-pass filter providing the received modulated signal to a pair of phase-locked loops. The first phase-locked loop provides a local oscillator signal tracking the exact frequency and phase of the received signal, which is itself locked to a multiple of a system-wide frequency. The second phase-locked loop acts as a synchronous data detector. Inversion circuitry, in the first phase lock loop, is controlled by the detected data output from the second phase-lock loop, for preventing the 180.degree. phase modulation from disturbing the frequency-tracking local oscillator phase-lock loop.

REFERENCES:
patent: 3196352 (1965-07-01), Hopner et al.
patent: 3466550 (1969-09-01), Wolf et al.
patent: 3611142 (1971-10-01), Welti
patent: 3899741 (1975-08-01), Brandt et al.
patent: 3944723 (1976-03-01), Fong
patent: 3944932 (1976-03-01), Fong
patent: 3973087 (1976-08-01), Fong
patent: 3973240 (1976-08-01), Fong
patent: 4101834 (1978-07-01), Stutt et al.
patent: 4109204 (1978-08-01), Kincaid et al.
patent: 4135181 (1979-01-01), Bogacki
patent: 4161720 (1979-07-01), Bogacki
patent: 4213096 (1980-07-01), Daniel, Jr.

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