| 摘要 |
PURPOSE:To make the circuit constitution and its adjustment easy, by using an attenuation coil of a picture filter and an audio pick up circuit in common. CONSTITUTION:A video and sound composite signal is current-amplified at a transistor (TR)6 via a video sound input terminal 5 and inputted to a sound trap and picture filter consisting of coils 30, 32, 33, 34 and 36, and capacitors 31 and 35. Coupling coils 37, 38 are coupled with the trap coils 32, 36 to obtain the 1st and 2nd sound carrier wave signals, which are demodulated at sound demodulation circuits 26, 27 respectively. Further, the picture signal eliminated with unnecessary signals of out-band can be picked up from a picture output terminal 25 via a TR24. |
