| 摘要 |
In one embodiment the apparatus includes a notch filter (104) for filtering frequencies of a first channel (CH3) from a first video source (90), the first video source having plurality of channels, to form a notch filter output having each of the plurality of channels except the frequencies of the first channel, a bandpass filter (107) for filtering a second video source (70) to pass only frequencies in a second channel in the second video source having the same frequencies as the frequencies of the first channel to form a bandpass filter output, a summer (108) for outputting the summed of the notch filter output and the bandpass filter output, and a television (40) for extracting data from the summed output. |
