| 摘要 |
PURPOSE:To prevent both channel working at the intermediate frequency of adjacent signal frequencies by comparing the sum of outputs and inputs of BPFs with each other. CONSTITUTION:The maximum value of the sum of outputs of BPFs 2 to 4 where respective signal frequencies are center frequencies is held in 18, and the value obtained by attenuating the maximum value of inputs by a fixed quantity is held in 20, and these held outputs are compared with each other in 24. Signal detection circuits 8 to 10 are controlled on a basis of the state of the comparison output. |
