Phase shift demodulator

Details Phase shift demodulator Phase shift demodulator

1983-06-10

1985-10-15

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329 50, 329124, 375 82, 375 85, H03K 904

Patent

active

045477388

ABSTRACT:
A quadrature demodulator for a phase shifted input pulse signal. The demodulator produces a four state digital code word on two output lines dependent upon the phase of the input signal. The input signal may have a phase shift, from the phase of the carrier signal, of zero degrees, +90.degree., -90.degree., or 180.degree.. The demodulator includes a clock-driven counter having an output signal at a fundamental frequency substantially identical to the carrier frequency of the input pulse signal. The counter produces additional output signals at frequencies which are multiples of the carrier frequency. The counter is synchronized with the input signal during a reference interval of zero phase shift, and a strobe circuit combines the various counter outputs to produce strobe signals to detect the phase shifted input signal. The strobe signals are used to clock a pair of flip-flops which each receive the input signal at a data input, with the Q outputs of the flip-flops providing the pair of output lines which indicate the four states of the digital code word.

REFERENCES:
patent: 3335369 (1967-08-01), Priebe
patent: 3798561 (1974-03-01), Bocker
patent: 3924186 (1975-12-01), Gordy et al.
patent: 4017803 (1977-04-01), Baker
patent: 4201884 (1980-05-01), Couch et al.
patent: 4287596 (1981-09-01), Chari
patent: 4320345 (1982-03-01), Waggener
patent: 4344041 (1982-08-01), Maine
patent: 4361895 (1982-11-01), Khoudari
patent: 4456884 (1984-06-01), Yarborough, Jr.

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