| 摘要 |
PURPOSE:To contrive to improve the sensitivity of separation control by obtaining a control signal of a prescribed pulse width in response to noise detection by a noise elimination circuit and integrating the said control signal so as to ensure the detection of multi-path noise. CONSTITUTION:A noise detection section 3 detects a noise from an input signal in a noise rejection circuit 1. A control pulse Generating section 4 generates a control signal having a pulse width in response to the frequency of output of the detection section 3. A noise pass inhibition section 5 inhibits the transmission of the input signal to the output terminal in response to the pulse width of the said control signal. A multipath detection circuit 2 uses a control pulse generating section 6 so as to use the detection signal from the detection section 3 as a trigger thereby generating the 2nd control signal having a prescribed pulse width and the integration circuit 7 integrates the control signal to detect the multipath. Since the control pulse generating section 6 uses the output of the detection section 3 as a trigger to generate the 2nd control signal of a prescribed width, even the multi-path noise appearing frequently does not give effect of detection delay. Thus, one-shot pulse noise in the receiving sound is suppressed and the multi-pulse noise is suppressed. |
