| 摘要 |
PURPOSE:To simplify a circuit through reducing the number of signal rectifying circuits and AND circuits, by executing the parallel connection of signal selection circuits. CONSTITUTION:The 1st matching resistors 2-1-6-1, band pass filters 2-2-6-2 having different passing frequency, the 2nd matching resistors 2-3-6-3, and variable attenuators 2-4-6-4 are used to constitute respective signal selection circuits, and the signal selection circuits 2-1-2-4 are connected in parallel with the selection circuits 3-1-3-4 and similarly, the respective signal selection circuits 4-1-4-4, 5-1-5-4, 6-1-6-4 are connected in paralle. When the selection callout signal consisting of two waves is applied to an input terminal and the signal is coincident with the frequency of the band pass filters, for example, if the signal of one wave passes through the filter 2-2 and the signal of another wave passes through the filter 4-2, respective signals are rectified at rectifiers 22, 23 and an output signal is transmitted from an AND circuit 24. |
