| 摘要 |
<p>PURPOSE:To record only a substantially desired program except an undesired program by detecting a low frequency control signal in receiving an audio signal mixed with a prescribed low frequency control signal at the time of transmitting a television broadcast program. CONSTITUTION:In receiving an audio signal being the mixture of a low frequency control signal at the outside of a prescribed audible band such as a different pulse number just before an undesired program and a desired program such as an advertising program at the time of transmitting television broadcast, a low pass filter circuit 4 detecting a low frequency control signal and a counter 8 receiving the output of the low pass filter circuit 4 are provided, and the recording and tentative stop of the program to be recorded based on the output of the counter 8 are controlled. Thus, the recording start/stop of a program to be recorded is controlled and a control signal sent/received just before/after the undesired program is used to record only the substantial program excluding the undesired program simply.</p> |
