Method and apparatus for demodulating PSK modulated oscillations

Details Method and apparatus for demodulating PSK modulated oscillations Method and apparatus for demodulating PSK modulated oscillations

1974-10-29

1976-07-20

Kominski, John

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

178 88, 325320, 329122, 329126, H03K 704

Patent

active

039709450

ABSTRACT:
A method and apparatus for demodulating an input signal modulated according to the phase shift keying (PSK) modulation method wherein the modulated input signal is combined with a reference voltage of the same frequency which is leading in phase by one-quarter of the period duration of the input signal, the resulting output signal is delayed in time by one-half of the period duration of the input signal and is combined with an identical but undelayed signal to provide a control voltage, and the control voltage is utilized for setting the phase of a further reference voltage which is then combined with the input signal to produce the demodulated output voltage.

REFERENCES:
patent: 3571712 (1971-03-01), Hellwarth et al.
patent: 3636454 (1972-01-01), Pasternack et al.
patent: 3656064 (1972-04-01), Giles et al.
patent: 3691466 (1972-09-01), Wachs

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