| 摘要 |
PURPOSE:To reduce mutual interference of signals for a large scale integrated circuit, by providing an active low pass filter at an output side of a circuit which generates the 2nd audio intermediate frequency and preventing an output of useless component at IC terminals. CONSTITUTION:A signal mixed with a video intermediate frequency fp and the 1st audio intermediate frequency fs1 is inputted to an input terminal 3 of a detector 1 of a TV receiver, it is detected at a detector 1, and the video intermediate frequency fp, 1st audio intermediate frequency fs1 and 2nd audio intermediate frequency fs2 are outputted. An active low pass filter 2 is provided at the output side of the detector 1 to prevent the video intermediate frequency fp and 1st audio intermediate frequency fs1 from mixing to the 2nd audio intermediate frequency fs2 outputted at an output terminal 4. Further, mutual interference of the signal for a large scale integrated circuit is reduced. |
