| 摘要 |
The audio noise removing circuit includes a second switch(4) for switching an output audio signal, a low pass filter(6) for removing noise due to the vertical synchronous signal in the audio signal, a first switch(3) for switching the audio signal filtered by the low pass filter(6) to output it to a TV, a synchronous signal seperating circuit(8) for seperating the synchronous signal from an output video signal, a vertical signal seperating circuit(9) for seperating the vertical synchronous signal from the synchronous signal and providing it to the first and second switches(3,4), and a switching device(11) for muting the vertical synchronous signal when a video tape is not play mode.
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