| 摘要 |
PURPOSE:To simplify a synthesis circuit and phase adjustment at the FSK dual filter envelope detector. CONSTITUTION:The detector is provided with a branching device 22 branching an FSK modulation signal 21 into two, a band pass filter 23 extracting a high frequency signal from the one branched FSK modulation signal, a band pass filter extracting a low frequency signal from the other branched FSK modulation signal, envelope detectors 25, 11 rectifying and detecting the high frequency signal and the low frequency signal in reverse direction, and a synthesizer 12 synthesizing two detected signal. |
