| 摘要 |
PURPOSE:To enable to detect the break and restoration of pilot signal, by a simple constitution that a rectifying circuit and a comparison and amplifying circuit are only provided. CONSTITUTION:A hybrid circuit HYB3 outputs the difference F between an input pilot signal B and a playback pilot signal B. A phase detector PD performs synchronizing detection for the difference signal F with a signal D to output the synchronized detection output G. A playback pilot signal E is rectified at a rectifying circuit REC2. The synchronizing detection output G and the signal I rectified at the rectifying circuit REC2 are synthesized at the adder ADD of a comparison amplifying circuit AMP3 and the result is compared with a reference voltage Vr at the comparating part CMP, allowing to output the pilot break detection signal from an output terminal OUT3. |
