| 摘要 |
Methods and apparatus for translating standard broadcast format color television signals to an encoding format for use in a transfer channel, and for retranslation of the signals to broadcast format. In one form of the invention, the broadcast format chroma signal is translated directly to transfer channel format without intermediate reduction to baseband. A second form of the invention achieves the same result by intermediate reduction to baseband of the chroma signal. The transfer channel format comprises chroma information amplitude modulated at a lower frequency than frequency modulated luma information, and enjoys exceptional independence from chroma cross-talk into luma in the restored broadcast signal as well as reduced cross-color distortion due to time base error in recording/playback transfer channels. An optional interlacing system provides even greater resistance to cross modulation effects. Audio information may be inserted without difficulty at frequency bands of the transfer channel not occupied by the encoded composite video signal.
|
