| 摘要 |
<p>A method and circuit to strip the composite sync from the composite video signal (112) is disclosed. This invention utilizes a phase locked loop (114) and a switchable input operational amplifier (110) to remove the sync portion of the video signal (112) without band limiting or introducing non-linearities to the video signal (112). The phase locked loop (114) creates a high frequency clock (106) from which a signal can be created that fully encompasses the sync portion of the composite video signal (112). This signal controls the switchable input op-amp (110) to select blank level during sync or allow the video to pass when sync is not present.</p> |
