| 摘要 |
A noise removing circuit for removing an impulse noise in a signal. An input selector switch receives a first signal and a second signal to selectively output the first and second signals. A polyphase sampling pulse generator outputs polyphase pulse trains. A plurality of sample-and-hold circuits are in cascaded connection to sample and hold the output of the input selector switch. Each of the sample-and-hold circuits is activated by pulses of a corresponding phase of the polyphase pulse trains to sample and hold a signal level being held on a preceding circuit. Each of a plurality of multipliers has a predetermined multiplication coefficient and outputs the signal level on each of sample-and-hold circuits multiplied with said predetermined coefficient. An adder adds up the outputs of the plurality of multipliers to produce the second signal.
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