| 摘要 |
PURPOSE:To eliminate noise at a switching time from a sub-channel to a main channel, by controlling a switch according to the slippage output of a discriminator in a FM receiver. CONSTITUTION:When the discriminator output is slipped to the positive or negative direction, this output is detected and amplified by circuit 6; and when the output has become over a prescribed value, the output is generated from circuit 7 to turn off switch 1 and cut off the input to sub-channel detector circuit 2. As a result, the noise at the time when switch circuit 4 has been just switched from circuit 2 to main channel circuit 3 can be eliminated. |
