Impact detecting circuit, impact detecting apparatus, and recording and reproducing apparatus including same

摘要

A first and a second integrating circuit and are connected to both terminals of an impact sensor, and a difference between integration outputs of the integrating circuits and is obtained by a differential amplifier. Voltage waveforms resulting from an input offset voltage in output terminals of the first and second integrating circuits and thereby cancel each other out. In essential impact detection, a comparator compares a differential output of the differential amplifier with a threshold level, whereby impact detection is performed.