Tracking control system for information reproducing apparatus

Details Tracking control system for information reproducing apparatus Tracking control system for information reproducing apparatus

1988-01-19

1991-06-25

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7714, 307362, 307353, G11B 5584, H03K 5153

Patent

active

050265091

ABSTRACT:
A tracking control system for an information reproducing apparatus employs a recording medium which has recorded therein a tracking signal including a pilot signal and a synchronizing signal. The tracking control system includes a synchronizing signal detection circuit which detects the synchronizing signal, a timing circuit which outputs a pulse delayed from a timing when the synchronizing signal has detected the synchronizing signal, an amplitude detecting circuit which obtains the amplitude of the pilot signal, a capacitor whose one terminal is connected to the amplitude detection circuit, a switching circuit whose one terminal is connected to the other terminal of the capacitor and whose other terminal thereof is fixed at a constant electrical potential, a switching control circuit which controls the switching of the switching circuit upon receiving the output of the synchronizing signal detection circuit, a sample/hold circuit which holds, upon receiving the pulse from the timing circuit, a voltage appearing at the connection point of the capacitor and the switching circuit. This held voltage is used as a tracking error signal.

REFERENCES:
patent: 4420778 (1983-12-01), Sakamoto
patent: 4843493 (1989-06-01), Furuhata et al.
"Servo Technology of R-DAT", Akihiko Hitomi et al., IEEE Transactions on Consumer Electronics, vol. CE-32, No. 3, Aug. 1986, pp. 425 to 431.

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