Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Patent
1989-05-04
1992-06-09
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
360 103, G11B 1514, H04N 578
Patent
active
051212641
ABSTRACT:
Two magnetic heads having different azimuth angles are mounted spaced from each other on a cylindrical rotary drum. Data is recorded on a magnetic tape using of the magnetic heads. On the magnetic tape, one track is formed by one of the magnetic heads and another (second) track is formed by another magnetic head. The two tracks form one frame on the tape. The data is recorded in the unit of one frame. When reproducing, the data recorded in one track is read out by one magnetic head, and the data recorded in the other track is read out by the other magnetic head. When reproducing in the normal direction, the data in one frame is first read out on one track and then on the other track. When reproducing in the reverse direction, first the data of the other track is read out, and the data is fed into a delay circuit composed of memory. The delay circuit, after the data of one track is read out and output, outputs the data of the other track. Also in reproduction in the reverse direction, the data composing one frame is output in the same sequence as in reproduction in the normal direction.
REFERENCES:
patent: 3580992 (1971-05-01), Eguchi et al.
patent: 4688115 (1987-08-01), Takahashi et al.
patent: 4819099 (1989-04-01), Saito
EP-A-26320 (International Business Machines Corporation) p. 12, line 19 p. 16, line 24; FIG. 2.
WO-A-8200558 (Spin, Physics, Inc.) p. 7, line 23-p. 9, line 24; FIG. 2.
EP-A-80297 (Sony Corporation) the whole document.
Psitos Aristotelis
Sharp Kabushiki Kaisha
Sheladia Varsha V.
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