Tracking control system for information reproducing apparatus

Abstract

A tracking control system for an information reproducing apparatus employs a recording medium which has recorded therein a tracking signal including a pilot signal and a synchronizing signal. The tracking control system includes a synchronizing signal detection circuit which detects the synchronizing signal, a timing circuit which outputs a pulse delayed from a timing when the synchronizing signal has detected the synchronizing signal, an amplitude detecting circuit which obtains the amplitude of the pilot signal, a capacitor whose one terminal is connected to the amplitude detection circuit, a switching circuit whose one terminal is connected to the other terminal of the capacitor and whose other terminal thereof is fixed at a constant electrical potential, a switching control circuit which controls the switching of the switching circuit upon receiving the output of the synchronizing signal detection circuit, a sample/hold circuit which holds, upon receiving the pulse from the timing circuit, a voltage appearing at the connection point of the capacitor and the switching circuit. This held voltage is used as a tracking error signal.