| 摘要 |
In a signal separation network functioning both as a trap circuit for intercarrier sound signal in a video signal path from a video detector 208 to video processing circuitry 280, and an output for sound processing circuitry 290, first 233 and second 232, 234 signal paths are coupled between detector 208 and video processing circuitry 280, the second signal path includes a first reactive impedance element 232, 234 of one sign, a third signal path 235 to ground is coupled to the second signal path and includes a second reactive impedance element 238 of an opposite sign and the signal developed across the third signal path is coupled to the input of the intercarrier sound signal processing circuitry 290. The three signal paths comprise a tuned circuit 230 tuned to exhibit a transfer function having a zero within a given range of frequencies occupied by the intercarrier sound signals at the input of the video processing circuitry 280 and exhibiting a pole within the given range of frequencies at the junction of the third signal path and the coupled input of the sound processing circuitry 290. <IMAGE> |
