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Color_TV_chroma_signal_processor

2014-11-25 04:59  
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Color_TV_chroma_signal_processor
Color TV chroma signal processor. The ECG728 provides subcarrier regeneration and total chroma signal processing prior to demodulation. The coils of the chroma amplifier and bandpass amplifier are stagger-tuned to provide a com-bined typical bandpass of 3.08 to 4.08 MHz. A burst separator amplifier injects the burst signal into the 3.58 MHz oscillator. The ACC detector and killer detector sense the burst level or absence of burst, respectively, by monitoring the osoil-lator's response to the burst injection level. The thresholdsfor the ACC and killer are independently adjusted by resistors R2 and R1 at terminals 9 and 4. The chroma input is at pin 14 and the oscillator output is at pin 8.Pin 6 is a zener diode for use as a regulated voltage reference at 11.9 volts (courtesy GTE Sylvania Incorporated).