Methods and apparatus for demodulating a differentially phase-mo

Details Methods and apparatus for demodulating a differentially phase-mo Methods and apparatus for demodulating a differentially phase-mo

1979-04-04

1980-12-30

Moore, David K.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 375 85, H03D 304

Patent

active

042426413

ABSTRACT:
The invention relates to methods and apparatus for demodulating a differentially phase-modulated digital input signal to produce an output signal representing the digital signal corresponding to the transmitted message.
The process comprises memorizing the last two digital samples of the input signal received, computing the series of digital sample phases of the input signal, before and after the last change of the input signal's initial phase, and then substituting for the difference between two phases having the same order number, the corresponding group of output signal bits.
Applicable in differentially phase-modulated signal transmission systems.

REFERENCES:
patent: 3535452 (1970-10-01), Oswald
patent: 3938052 (1976-02-01), Glasson et al.
patent: 3947633 (1976-03-01), Burger

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