| 摘要 |
PURPOSE:To obtain an output with less distortion while removing pulse noise completely by providing a sample-and-hold circuit for the output of a detector to a reception signal system, turning on a gate by a detection output so as to hold the reception signal just before noise detection. CONSTITUTION:An input is amplified (1), mixed (2) with the output of a local oscillator 4 and the result becomes an intermediate frequency, is subjected to amplification 8 and detection 3 and outputted via the sample-and-hold circuit 7. When a pulse noise is included in the input signal, the result is subjected to amplification 9, detection 19 and waveform shaping 6, the gate 5 is turned on to turn off the output of the local oscillator 4. Thus, the noise is removed. On the other hand, the pulse subjected to waveform shaping 6 is fed to the sample-and-hold circuit 7, and the output signal level just before the production of noise is held to a value at the production of noise. Thus, the noise is removed completely and the output with less distortion is obtained.
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