Pulsive component detecting apparatus

摘要

An input signal including a pulsive noise such as an ignition noise in superposition on a continuous noise such as a white noise is applied commonly to the base electrodes of a pair of transistors of the same conductivity type implementing a differential amplifier. The amplified signal is applied to first and second rectifying circuits for full-wave rectification. The output of the first rectifying circuit is detected by a detecting circuit. The output of the second rectifying circuit is applied to a pulsive noise detecting circuit for detection of a pulsive component. The ratio of the detecting level of the detecting circuit to the detecting level of the pulsive noise detecting circuit is determined for avoiding malfunction of the pulsive component detecting circuit by virtue of the continuous noise.