Automatic track locking state check circuit

Details Automatic track locking state check circuit Automatic track locking state check circuit

1991-05-17

1994-08-02

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 7301, 360 7308, 360 7715, G11B 2104

Patent

active

053351223

ABSTRACT:
In a rotary digital audio tape recorder, an automatic track finding locking state check circuit comprises a variable speed playback mode selector for logically combining the control data for the forward direction or the reverse direction and each n-fold multiple speed and for selecting the playback mode, a counter for counting sample-hold pulses for a predetermined time, a decoder for decoding the result of the sample-hold pulse count according to the result of variable speed playback mode selection, a latch portion for being synchronized to the predeterminedly delayed switching head pulse to latch the decoding result, thereby generating the automatic track finding locking signal, and a locking check clock generator for setting the locking range according to the switching head pulse and the system reset or the microcomputer reset signal state, and controlling the generation of the automatic track finding locking signal of the latch portion and the initiation of the counter. Since the ATF determines whether or not the locking of the tracking servo occurs, the stability of the system is raised.

REFERENCES:
patent: 4594621 (1986-06-01), Noguchi et al.
patent: 4780774 (1988-10-01), Edakubo et al.
patent: 4791507 (1988-12-01), Doyama et al.
patent: 4899233 (1990-02-01), Yoshida
patent: 4985786 (1991-01-01), Arai et al.
patent: 5026509 (1991-06-01), Arai et al.

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