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Consumer Electronics by S. P. Bali

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THE PAL SYSTEM

The PAL system, which is a refinement of the NTSC system, has been adopted in our country. The PAL system aims to improve the colour picture. The signals are transmitted in the same way, but the receiver delays the information on every line by means of an ultrasonic device for the exact time needed to compare it with the signal for the next line. If, for example, a certain line of the picture, as received, contains too strong a red signal, the system ensures the next line will be too low on red by reversing the polarity of alternate lines. The final information passed to the picture tube is the average of the delayed first line and the corrected second line, so cancelling out the error. No hue control is necessary.

The PAL (Phase ...

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