Fast search device in a magnetic recording and reproducing devic

Details Fast search device in a magnetic recording and reproducing devic Fast search device in a magnetic recording and reproducing devic

1988-07-14

1991-06-04

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 722, 360 7305, G11B 553, G11B 15467

Patent

active

050218964

ABSTRACT:
A magnetic recording and reproducing device such as an R-DAT performs fast search for detecting a desired reproducing position during fast feeding or rewinding of recorded tape. The magnetic recording and reproducing device comprises a rotary head incorporating a rotary drum for recording and reproducing an input signal by tracing a magnetic tape, a rotary drum drive circuit for driving the rotary drum for rotation, a tape reel drive circuit for driving a tape reel for running a magnetic tape and a relative speed detection circuit for detecting relative speed between the magnetic tape and the rotary head. The rotary drum is driven in such a manner that, upon receiving a fast search order, the relative speed substantially becomes a predetermined speed without increasing the tape speed. After reaching of the relative speed substantially to the predetermined speed, the rotation speed of the rotary drum or the tape reel is changed gradually to a speed used during fast searching and the rotation speed of the tape reel or the rotary drum is changed against the change in the rotary drum or the tape reel after reaching of the relative speed to the predetermined speed while maintaining the relative speed substantially at the predetermined speed. The device can read information for fast search such as start ID, music number and time data recorded on the tape is a stable manner from the start of the search.

REFERENCES:
patent: 4626936 (1986-02-01), Yoshino
patent: 4636874 (1987-01-01), Hoogendoorn et al.
patent: 4688115 (1987-08-01), Takahasi et al.

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