| 摘要 |
PURPOSE:To eliminate the sound crosscolor, by controlling the trap quantity by an AGC voltage. CONSTITUTION:Radio waves received by an antenna 1 reach a video amplifying circuit through a tuner 2, a sound trap circuit 3, a filter circuit 4, a video intermediate frequency amplifying circuit 5, and a video detecting circuit 6. When the antenna input field becomes stronger, an AGC circuit 7 increases the trap quantity in the circuit 3 through a sound trap quantity control circuit to eliminate the sound crosscolor. |
