| 摘要 |
In a noise reduction circuit, a sample-and-hold circuit operating on a tracking mode is sampled in response to the occurrence of a noise impulse. The voltage sampled is stored in the capacitor of the sample-and-hold. A slope detector is responsive to the capacitor voltage for generating an output representative of the rate of variation of the capacitor voltage. A voltage-to-current converter is connected between the output of the slope detector and the capacitor for converting the voltage to a corresponding current and injecting the current to the capacitor when the rate of variation is positive and draining the current from the capacitor when the rate is negative.
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