| 摘要 |
A CATV converter having a filter for extracting a voice intermediate frequency signal superposed with a data signal necessary to descramble a scrambled television signal by AM modulation, a synchronous detector responsive to the extracted voice intermediate frequency signal for detecting the data signal, a tank circuit for tuning with the carrier to apply the carrier of the voice intermediate frequency signal to the synchronous detector, and a voice detector for producing the voice intermediate frequency signal from the tank circuit to input it thereto. Thus, the converter can separately produce a data signal and a voice signal at a preferable S/N ratio with a simple configuration.
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