| 摘要 |
PURPOSE:To prevent a mulfunction caused by noise by detecting a noise on a position pulse signal and controlling a gate signal not to peak-hold the said noise. CONSTITUTION:In case there is an influence of noise, the sum of the voltage values of a noise-detecting peak-holding signal 10 and of that 12, or the sum of the voltage values of those 11 and 13 becomes larger than a specified voltage value by a margin equal to the level of the said noise. Consequently, the signals 10-13 that are the outputs from peak-holding circuits 6-9 are inputted to a noise-detecting circuit 24 to judge on the presence/absence of noise. That is, if there is the influence of the noise, the circuit 24 outputs a noise detection signal 25 of 'low' level. Accordingly, gate control circuits 26-29 output control- delaying gate signals 30-33 which proves as delay gate signals 20-23 in high level so that peak-holding circuits 34-37 do not peak-hold the noise. |
