Frequency demodulator for television receiver with time multiple

Details Frequency demodulator for television receiver with time multiple Frequency demodulator for television receiver with time multiple

1985-05-31

1987-12-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358142, 358141, 455266, 455340, 329136, 329139, H04N 704, H04N 708

Patent

active

047136898

ABSTRACT:
A receiver is provided for a television system which uses time division miplexing (TDM) of analog image signals and of bursts of duobinary coded digital data signals. The digital data signals are transmitted during the line and frame blanking intervals and grouped together in packets, comprising the sound and synchronization signals, the spectral width required by the analog part being greater than that required by the digital part. The receiver comprises a common frequency demodulator for the analog and digital signals, adaptive as a function of the signal-to-noise ratio after demodulation as a width less than the width which is optimum for the analog part when the latter has a high signal-to-noise ratio. The demodulator has an input filter which is either analog or digital and may be adjusted in response to the error rate.

REFERENCES:
patent: 3984624 (1976-10-01), Waggener
patent: 4045740 (1977-08-01), Baker
patent: 4245353 (1981-01-01), Bynum
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patent: 4339829 (1982-07-01), Dimon
patent: 4435821 (1984-03-01), Ito et al.
patent: 4472685 (1984-09-01), Dutasta
patent: 4531148 (1985-07-01), Ohta et al.
patent: 4551755 (1985-11-01), Matsuda et al.
patent: 4563651 (1986-01-01), Ohta et al.

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