Playback apparatus for rotary recording medium

摘要

Playback apparatus for a rotary recording medium includes a playback head for sensing signals from a plurality of tracks which are formed on a rotary recording medium in such a manner that the front end of recording operation continues to the last end thereof; a head move unit for movably supporting the playback head; an envelope detect device for detecting an envelope of signals sensed by the playback head; and a control unit for controlling the head move unit to move the playback head to a desired one of the plurality of tracks based on the detected envelope. The control unit, in order to control the head move unit to move the playback head in a first direction, is adapted to count the distance moved by the playback head with reference to a predetermined reference position, and to control the head move unit to move the playback head in a second direction opposite to the first direction when an envelope is not detected successively at track positions associated with a predetermined number of tracks.