Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1975-07-24
1976-11-02
Grimm, Siegfried H.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
325320, 329117, 329126, 329145, H03D 302
Patent
active
039900150
ABSTRACT:
In the present invention a received DPSK signal is sampled at times corresponding to a peak signal to noise ratio and the sample of signal is passed to a circulating memory. A phase detector is connected to receive the DPSK signal and the sample of signal circulating in the memory to provide an output signal indicative of the phase relationships between the received DPSK signal and the circulating sample signal. A sampling means samples the output signal from the phase detector at the correct bit time, to provide a signal which is a function of the differential phase between adjacent bits of the received DPSK signal.
REFERENCES:
patent: 3843932 (1974-10-01), Fischman
patent: 3906376 (1975-09-01), Bass
webster et al., "Correlation Data Demodulator", RCA Technical Notes, No. 839, June 4, 1969, pp. 1,2.
Chambers Ramon P.
Gordy Robert S.
Morrison Cameron E.
Sanders David E.
Cavender J. T.
Dugas Edward
Grimm Siegfried H.
NCR Corporation
Sessler Jr. Albert L.
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