Tracking control apparatus for use with magnetic tape having vid

Details Tracking control apparatus for use with magnetic tape having vid Tracking control apparatus for use with magnetic tape having vid

1989-03-29

1991-04-30

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 7713, G11B 552, G11B 15467

Patent

active

050123580

ABSTRACT:
In a tracking control apparatus using a microcomputer, a speed signal proportional to the rotating speed of a capstan motor is generated by an FG coil and applied to a CPU and a latch in the microcomputer. Time data generated by a time counter is held by the latch every time the speed signal is generated. The CPU calculates the rotation frequency of the capstan motor in accordance with the interval of time of generation of the speed signal based on the time data. When a reference signal generated by a reference signal generator and a control signal reproduced by a control head are applied to the CPU, each time data therefor is held by a separate latch. The CPU thus calculates a phase error of the capstan motor in accordance with the difference in the time data for the reference and control signals. The CPU further calculates control data from the rotation frequency and phase error of the capstan motor. The level of a video signal reproduced by a video head is detected by a peak detector. The CPU then adjusts the control data for the capstan motor so that the level of the reproduced video signal becomes maximum.

REFERENCES:
patent: 4689706 (1987-08-01), O'Gwynn
patent: 4716473 (1987-12-01), Kondo
patent: 4725895 (1988-02-01), Niyamoto et al.

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