| 摘要 |
<p>PURPOSE:To eliminate the need for the fine adjustment of the DC potential of an input to an A/D converter and to improve stability by providing a digital filter circuit that passes a color difference signal but interrupts a color subcarrier frequency and its odd-numbered higher harmonic components. CONSTITUTION:The digital filters 7, 12 are connected to the output sides of the code inversion circuits 5, 6 of a title circuit. These filters 7, 12 respectively are constituted of sample-hold circuits 8, 9, 13, 14, an adding circuit 10, 15, and a multiplier circuit 11, 16, and the frequency characteristic for which the filters 7, 12 passes a color difference signal sufficiently and interrupts sufficiently color subcarrier frequency and its odd-numbered higher harmonic components can be obtained.</p> |
