Method and apparatus for the digital control of the phase of the

Details Method and apparatus for the digital control of the phase of the Method and apparatus for the digital control of the phase of the

1982-09-08

1985-07-02

Masinick, Michael A.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 946

Patent

active

045271453

ABSTRACT:
Method for digitally controlling the phase of the system clock frequency of a digital signal processing system which processes an analog signal containing a reference signal, wherein a fixed phase relation exists between the digitalized reference signal and the system clock frequency, which includes digitalizing the reference signal by sampling the analog reference signal, weighting the scanning values of the digitalized reference signal for obtaining a digital phase comparison variable, feeding the phase comparison variable through a digital PLL filter to a digitally controlled oscillator, and deriving the system clock frequency from the output signal of the digitally controlled oscillator, and an apparatus for carrying out the method.

REFERENCES:
patent: 4291332 (1981-09-01), Kato
patent: 4339770 (1982-07-01), Dennison
patent: 4395729 (1983-07-01), Lewis
patent: 4404583 (1983-09-01), Tatami

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