| 摘要 |
PURPOSE:To suppress undesired electric waves and to prevent a radio interference to a faint electric wave, by providing a gate circuit which produces an output signal only when each output signal is set at a prescribed level and a means which continues detection until the output signal disappears. CONSTITUTION:The 1st tuning amplification wave detector 2 synchronizes with only the higher harmonic wave of the prescribed second degree of a signal received throguh an antenna 1. The amplification and wave detection are given to the synchronized signal, and this signal is applied to an amplifier 4 and an AND gate circuit 5. While the 2nd tuning amplification wave detector 3 synchronizes with the signals of the second degree excepting a high frequency of a prescribed high degree of a received signal. The amplification and wave detection are given to the synchronized signal, and this signal is applied to the amplifier 4 and the circuit 5. The outputs of wave detectors 2 and 3 are amplified up to the saturated voltage by the amplifier 4 and then supplied to the circuit 5. When the outputs of the detectors 2 and 3 and the amplifier 4 are set the prescribed gate opening levels respectively, an output signal is produced from the circuit 5. This output signal is applied to a delaying circuit 6. The circuit 6 continues detection until the signal disappears to suppress the mixture of undesired electric waves. |
