| 摘要 |
A main and sub screen switching circuit for a PIP (picturein-picture) television includes a micro computer (20), two PLL (phase-locked loop) circuits (30,31), an on-screen generator (110), two tuners (40,41) for selecting channels, two image detectors (50,51), a PIP module (80) for supplying the PIP video signal to a CRT, and a voice signal detector (60) for providig the audio signal to an audio amplifier (100). |
