| 摘要 |
<p>A composite video signal is formed in which high luminance frequencies are modulated so that they occupy frequencies above the chrominance band. A sub-band coder (102) is used to split the luminance frequency band into high and low frequencies at the coder, and an inverse sub-band coder (108) combines the high-frequency luminance and the chrominance components. The two resultant signals are applied to a phase-segregated Weston Clean PAL coder (120) to provide a composite video signal, which is compatible with a conventional PAL signal.</p> |
