Circuit arrangement for filtering and demodulating a signal freq

Details Circuit arrangement for filtering and demodulating a signal freq Circuit arrangement for filtering and demodulating a signal freq

1986-06-02

1987-11-24

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358198, 329110, 329112, 381 3, H04N 544, H04N 560

Patent

active

047092700

ABSTRACT:
A digital television receiver circuit filters and demodulates a signal contained in the input signal of the television receiver and frequency-modulated with at least one audio signal. The only A/D converter required in the circuit is the converter for changing the video signal from analog to digital form. The circuit uses digital filters, a digital mixer, decimation stages and a digital frequency demodulator stage to separate the audio signal from the composite video signal.

REFERENCES:
patent: 4139866 (1979-02-01), Wegner
patent: 4158858 (1979-06-01), Janssen
patent: 4496979 (1985-01-01), Yu et al.

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