Composite video signal processing apparatus providing amplitude

Details Composite video signal processing apparatus providing amplitude Composite video signal processing apparatus providing amplitude

1983-03-30

1985-05-07

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 35, H04N 9535

Patent

active

045161534

ABSTRACT:
In a color TV receiver, a composite video signal processing circuit serves to prepare the signal input to a CCD comb filter, and includes a transistor phase splitter with a first load resistor connected to the transistor's collector electrode and a second load resistor connected to the transistor's emitter electrode. A reactance of a first sign couples the collector electrode to an output terminal, while a reactance of the opposite sign couples the emitter electrode to the same output terminal. A capacitor between the transistor's collector and base electrodes provides a negative feedback path for signal components. Parameter values are selected to provide the processing circuit with a peak response at a frequency above the frequency band occupied by the composite video signals. Processing circuit provides a substantially constant group delay for signal frequencies throughout the band, while compensating for decline at high signal frequencies of IF amplifier's amplitude-versus-frequency characteristic.

REFERENCES:
patent: 4158852 (1979-06-01), Harlan
patent: 4263612 (1981-04-01), Gibson et al.
patent: 4288811 (1981-09-01), Naimpally
patent: 4371891 (1983-02-01), Yost
RCA Television Service Data Pamphlet, 1981, C-3, pp. 38-39.

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