| 摘要 |
The level of a noise removed signal which is currently delivered is compared against the level of an input signal to be detected. If the non-coincidence therebetween continues over a given time interval, the level of the noise removed signal is inverted. In this manner, noises having stable levels which do not last over the given time interval are removed, thus deriving a favorable noise removed signal. In an alternative form, the level of a noise removed signal which is currently delivered is compared against the level of an input signal to be detected. When there is a non-coincidence therebetween which lasts over a first given time interval, when there is a coincidence which lasts over a second given time interval and when a third given time interval or more has passed, a noise removed signal is inverted. In this manner, a noise removed signal is obtained from which noises having a stable level which lasts less than the first given time interval, which occur sporadically or which fluctuate with relatively long periods are removed.
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