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Consumer Electronics by S. P. Bali

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COLOUR RECORDING

The first video tape recorders were for black-and-white signals. Later, methods were developed that permitted the recording of colour signals.

What has been described so far is only concerned with the luminance component of the TV signal. The space between zero and 1 MHz in the tape-frequency spectrum, Fig. 33.4, is reserved for the chroma signals, and to prevent it from being encroached upon by the lower sideband of the luminance FM signal, the rise time and frequency range of the latter are reduced in the pre-modulator luminance processing stages; any short comings in this bandpass filter will permit luma and chroma signals to cross-modulate with consequent patterning in the playback picture.

The colour signal is recorded ...

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