| 摘要 |
<p>A method and apparatus for superimposing DC power on a baseband composite video signal. Negative DC power source (150) switches power into a composite video signal during a time period in which the composite video signal normally contains a horizontal and/or vertical synchronization pulse. The power signal is demultiplexed and supplied to a power storage element (150) such as a storage capacitor which supplies a switched mode power supply to supply power.</p> |
