| 摘要 |
<p>For the purpose of data compression and expansion in the playback mode reproducing data including video data and audio data recorded on a magnetic tape (2), a relative speed signal is generated from a circuit (86) on the basis of the moving speed of the magnetic tape and the rotation speed of a head drum (1), and the characteristic of the recorded data is controlled according to this relative speed signal. The tension of the magnetic tape is detected by a circuit (97), and the phase difference between the detected tape tension signal and a reel rotation speed command signal is detected by a circuit (98) so as to control the tape tension according to the detected phase difference. When a target value of the drum rotation speed is changed, a drum drive signal is changed stepwise at a predetermined time interval, and the amount of delay of a drum rotation reference signal delayed according to a signal indicative of the rotation speed of a capstan (8) is changed, so as to determine the range in which both the capstan rotation speed and the drum rotation speed can be changed. Interfaces (17, 76) are disposed between a system controller (16) and a pitch controller (77) so as to control the tone pitch of the audio signal according to the capstan rotation speed signal.</p> |
