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Consumer Electronics by S. P. Bali

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CVBS SIGNAL

TV video signal cannot be recorded directly on tape in its basic form, due to bandwidth and noise problems. This is true of both luminance and chrominance components and each has to undergo a great deal of processing in both record and replay modes, first to convert them to a form amenable to the tape system and then to restore from the off-tape video signals, a video signal which corresponds as closely as possible to that recorded. We have three signals to cater for: luminance, chrominance and sound, and each is handled separately in the VCR. These signals usually come from a common source—the VCR's detector working on broadcast signals or a TV camera—and are eventually combined (in the VCR's RF modulator) into a single composite ...

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