Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1995-04-18
1996-12-24
Kim, W. C.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 61, 360 65, 360 69, G11B 509
Patent
active
055878482
ABSTRACT:
In a magnetic recording and reproducing apparatus, a recording current setting circuit sets a recording current to be larger by 1 dB or more than a recording current which maximizes a reproduced signal level in correspondence to the shortest recording wavelength in digital signals to be recorded. Recording is performed with a magnetic head onto a metal powder tape including a magnetic layer of thickness having a 0.2 .mu.m or less. Thus, an overwrite characteristic can be obtained which are generally similar to that of a metal evaporation tape. Further, on reproduction, either an output from a equalizer circuit for a metal evaporation tape or an output from another equalizer circuit for a metal powder tape is selected by a switch circuit according to an output of a tape type detection circuit, and loop control gain of a tracking control circuit is changed according to the detected tape type. Thus, both metal powder tapes and metal evaporation tapes can be used.
REFERENCES:
patent: 4613912 (1986-09-01), Akira et al.
patent: 5182693 (1993-01-01), Koga et al.
patent: 5311373 (1994-05-01), Murabayashi et al.
1993 IEEE International Magnetics Conference (Intermag '93), Stockholm, Sweden, 13-16 Apr. 1993, vol. 29, No. 6, Pt. 2, ISSN 0018-9464, IEEE Transactions on Magnetics, Nov. 1993, USA, pp. 3954-3956, "Investigation on Tape-Head Contact in VTR", Nov. 1993, Okuwaki et al.
Sanyo Technical Review, 1985, vol. 17, No. 2, pp. 21-44, "Develpment of 8mm Video System", Hiro et al.
Kuroe Akio
Shimotashiro Masafumi
Kim W. C.
Matsushita Electric - Industrial Co., Ltd.
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