Phase demodulator with offset frequency reference oscillator

Details Phase demodulator with offset frequency reference oscillator Phase demodulator with offset frequency reference oscillator

1975-02-20

1977-08-16

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325346, 325419, 329107, 331 23, 331 25, H03D 306, H04L 2722

Patent

active

040428842

ABSTRACT:
A phase-locked demodulator for demodulating a phase-difference modulated carrier having a repeated phase offset increment introduced therein. The demodulator includes, in common with conventional phase locked demodulators, a mixer having a first input connected to receive the modulated carrier and a reference carrier generator such as a voltage controlled oscillator (VCO) connected in a phase-locked feedback loop forming the second input to the mixer. In order to reduce the number of output levels, the VCO is tuned to a frequency Fr=Fc.+-.Fb[(.alpha.)/360] where Fc is the carrier frequency, Fb is the baud rate and .alpha. is the repeated phase offset. In this way the phase offset increment introduced into the modulated carrier is substantially cancelled out thereby leaving only the phase changes containing data information.

REFERENCES:
patent: 3204185 (1965-08-01), Robinson
patent: 3626301 (1971-12-01), Develet, Jr.
patent: 3906380 (1975-09-01), Querry et al.

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