| 摘要 |
<p>PURPOSE:To miniaturize the circuit by incorporating a video envelope detecting circuit into a head amplifier IC installed in the vicinity of a video head. CONSTITUTION:A video envelope detecting circuit 18 is incorporated into a head amplifier IC installed in the vicinity of a video head. That is, the video envelope detecting circuit 18 is formed of a Y band high-pass filter 18b constituted of a resistance and a capacitor, and a detecting circuit 18e constituted of an amplifier, a transistor, a resistance and a capacitor, and they can be bormed into IC formation. Also, this IC video envelope detecting circuit 18 is incorporated into a head amplifier which is made into IC-formation already and installed in the vicinity of the video head, and they form a head amplifier IC. In such a way, the whole video signal reproducing circuit can be miniaturized.</p> |
