| 摘要 |
Apparatus for recording or reproducing both digital and analog signals on or from respective substantially concentric recording tracks on a rotating magnetic disc with only digital or analog signals being recorded in any one of the tracks comprises a transducer mounted in substantially contacting relation to the magnetic disc for recording or reproducing the digital and analog signals on or from the tracks, a motor coupled to the transducer for moving the transducer radially with respect to the magnetic disc, a track status memory for storing track ID (identifying) information for each of the recording tracks and producing a track classifying signal corresponding thereto, and a level detecting circuit for detecting levels of signals reproduced from the tracks and producing a level indicating signal corresponding thereto. A control is jointly responsive to the track classifying signal and the level indicating signal for controlling the motor so that it positions the transducer in closed-loop servo tracking relation to a given track on the basis of the level indicating signal when the track classifying signal indicates that the given track or at least one track adjacent thereto contains an analog signal and otherwise effects open-loop positioning of the transducer regardless of the level indicating signal. This enables accurate reproduction of the analog signals coupled with rapid access to the digital signals.
|
