Receiver for phase shift modulated carrier signals

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

H - Electricity

04

B

325/72

H04B 15/00 (2006.01)

Patent

CA 1151245

RD-12,122 RECEIVER FOR PHASE-SHIFT MODULATED CARRIER SIGNALS Abstract of the Disclosure 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 phase modulation from disturbing the frequency-tracking local oscillator phase-lock loop.

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