Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1994-10-13
1998-06-02
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 7704, G11B 1552, G11B 5596
Patent
active
057609888
ABSTRACT:
A tracking method and apparatus used in a helical scan magnetic recording/reproducing system is based on an automatic tracking control using an envelope detection signal of a reproduced signal. The tracking apparatus is provided with a circuit for controlling the rotation speed of a capstan motor which transports a magnetic tape, a level comparing circuit for making the comparison for the level of an envelope signal of the reproduced signal, a circuit for applying a predetermined deviation to the rotation speed in accordance with the result of comparison, a circuit for detecting a steady speed deviation between a recording apparatus and a reproducing apparatus from a speed deviation signal generated in the process of the automatic tracking control, and a circuit for correcting the speed deviation.
REFERENCES:
patent: 4613914 (1986-09-01), Kobori et al.
patent: 4618899 (1986-10-01), Doutsubo
patent: 4647990 (1987-03-01), Sasamura
patent: 4777543 (1988-10-01), Nishijima et al.
patent: 5270873 (1993-12-01), Sakai et al.
Abe Hiroya
Kaniwa Kouji
Minabe Kouji
Narita Yoshio
Nishijima Hideo
Hitachi , Ltd.
Neal Regina Y.
Psitos Aristotelis M.
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