System for demodulating frequency- or phase-modulated signals by

Details System for demodulating frequency- or phase-modulated signals by System for demodulating frequency- or phase-modulated signals by

1989-02-15

1992-07-07

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 83, 375 88, 329302, 329306, 455214, H03D 300

Patent

active

051289660

ABSTRACT:
A system for digitally demodulating a frequency- or phase- modulated signal by mixing a carrier wave of the modulated signal and a local oscillation signal so as to produce first and second analog signals of quadrature-phase intermediate frequency having a phase difference of 90 degrees, the system comprising: a phase-digital converter for detecting the variation of a fixed phase period of the first and second analog signals to produce a signal for establishing the period of a quantization step; an interface device for producing variable phased information for the pertinent quantization step according to the phase relationship of the phase-digital signal; and signal processor for storing the quantized phase information of the interface, accumulating, by a sampling signal of a fixed period, the variable phase information stored during the sampling period, thereby demodulating the modulated signal.

REFERENCES:
patent: 4083009 (1978-04-01), Bickford et al.
patent: 4577157 (1986-03-01), Reed
patent: 4674105 (1987-06-01), Suzuki
patent: 4682117 (1987-07-01), Gibson
patent: 4736392 (1988-04-01), Kammeyer et al.
patent: 4755761 (1988-07-01), Ray
patent: 4879728 (1989-11-01), Tarallo
patent: 4888793 (1989-12-01), Chanroo et al.
patent: 4912422 (1990-03-01), Kobayashi et al.

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