Digital demodulator with a unit for correcting over modulation a

Details Digital demodulator with a unit for correcting over modulation a Digital demodulator with a unit for correcting over modulation a

1993-03-10

1994-03-08

Hajec, Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

358330, 358340, 348607, H04N 979, H04N 591, H04N 5213

Patent

active

052932478

ABSTRACT:
A digital demodulator includes a reproducing head for reproducing an analog video signal from a recording medium, an analog to digital converter for converting the analog video signal applied from the reproducing head into a digital signal, a Hilbert transform circuit for transforming the digital signal into signals whose phases are shifted by first and second angles from the digital signal, respectively, a frequency detector for detecting a frequency of the transformed signals, a first coefficient circuit for weighting an output signal of the frequency detector, a second coefficient circuit for weighting the transformed signals, a multiplier for multiplying output signals of the first and second coefficient circuits together, an equalizer for correcting a frequency characteristic of the transformed signals, and a demodulator for demodulating an output signal of the equalizer, wherein the frequency characteristic of the equalizer is corrected in accordance with an output of the multiplier.

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patent: 5130811 (1992-07-01), Ganse
patent: 5136392 (1992-08-01), Ganse
patent: 5142376 (1992-08-01), Ogura

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