RGB encoder for producing a composite video signal for NTSC and

Details RGB encoder for producing a composite video signal for NTSC and RGB encoder for producing a composite video signal for NTSC and

1994-01-28

1995-03-28

Groody, James J.

Television

Image signal processing circuitry specific to television

Color encoder or chrominance signal modulator

348707, H04N 965

Patent

active

054021804

ABSTRACT:
An RGB encoder includes a Y-matrix processor, a chrominance signal processor, a bandpass filter, a delay element, an OTA (operational transconductance amplifier) control signal generator and a mixer. The OTA bandpass filter has a plurality of operational transconductance amplifiers for bandpass-filtering the chrominance signal, wherein the passband is varied according to the transconductance of the operational transconductance amplifiers included therein. The OTA delay element has a plurality of operational transconductance amplifiers for receiving and delaying the luminance signal, wherein the delay time is varied according to the transconductance of the operational transconductance amplifiers included therein. The OTA control signal generator generates first and second control signals in accordance with an NTSC/PAL select signal. The first control signal controls the transconductance of the operational transconductance amplifiers included in the OTA bandpass filter and the second control signal controls the transconductance of the operational transconductance amplifiers included in the OTA delay element. The mixer mixes the outputs of the bandpass filter and delay element, in order to produce a composite video signal. The RGB encoder has lower manufacturing costs and reduced power consumption.

REFERENCES:
patent: 4255758 (1981-03-01), Aschwanden
patent: 4982179 (1991-01-01), Ogawa
patent: 5317216 (1994-05-01), Hosoya

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