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Consumer Electronics by S. P. Bali

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CHROMINANCE SIGNAL

The generation of chrominance signal involves the separation of the luminance signal, EY from the natural colour signals, ER, EG and EB. This is shown in Fig. 31.6. The natural colour signals ER, EG and EB are developed across resistors R1, R2 and R3 respectively. Part of the voltage across these resistors (0.3 V across R1, 0.59 V across R2, and 0.11 V across R3) is tapped off. The full potential difference across R1, R2 and R3 is simultaneously fed to the adders in stages 2, 3 and 4.

When a white scene is being televised, the three pick-up tubes will extract the three primary colours from the white light and develop corresponding voltages across R1 R2 and R3. Since light falls on all the three pick-up tubes with the same intensity, ...

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