Abstract: A cartridge of a single reel is inserted and information is recorded and reproduced by a helical scan type using a rotary head. A control pulse is reproduced from a recording signal of a control track of a magnetic tape by a fixed head. A repositioning operation and a high speed search are controlled on the basis of the control pulse. A torque ripple of a capstan motor is previously measured. When the tape runs, a motor drive current is corrected so as to reduce a torque change of one rotation on the basis of the measurement result, thereby improving a wow and flutter. A switching timing of motor coils by Hall sensors is set to an early timing, thereby suppressing a torque fluctuation. A regenerative braking circuit is formed by an OFF timing of a PWM control and a tape back tension is formed by a decrease in torque by the regenerative braking circuit. A tape thread and a tape wrap at the time of the insertion of the cartridge are simultaneously executed.

Abstract: In a current supply circuit for supplying a current to a reel-drive motor in a magnetic tape apparatus, the circuit includes: a conversion table storing a relationship between a radius of the magnetic tape wound on a reel and a target current to be supplied to the reel-drive motor, and the target current being converted to a digital command; a correction table storing a relationship between the digital command and an actual current flowing in the motor when the digital command is applied to the motor, the actual current being converted to a digital value; a command unit for outputting the digital command corresponding to the target current in accordance with the conversion table; a supply current control unit for supplying an analog current corresponding to the digital command to the motor; a first correction unit for applying first correction signal to the supply current control unit in response to the actual current flowing in the motor; and a second correction unit for supplying a second correction signal

Abstract: A recording medium library system retaining up to a predetermined number of cartridge type recording media for recording/reproducing data on the recording medium is disclosed. The recording media are stored in a plurality of cells provided in a cell drum. The cell drum is rotatably driven such that a desired cell is brought to a target position. In the driving, an accelerating current, a braking current, and a positioning current are supplied to the motor in order of mention. At least the braking current is determined according to an input value of the inertia of the cell drum.