Electricity: measuring and testing – Magnetic – With compensation for test variable
Patent
1993-04-09
1996-12-24
Snow, Walter E.
Electricity: measuring and testing
Magnetic
With compensation for test variable
361 25, 361 31, 324212, G01R 3312, G01N 2772, G11B 502, G11B 2734
Patent
active
055876544
ABSTRACT:
A method and apparatus is disclosed or determining the remanent noise in a magnetic medium by DC saturation of a region thereof and measurement of the remaining DC magnetization. Conventional recording transducers may be used to determine the remanent noise. Upon determination, the remanent noise may then be compensated for in either or both of the record and playback modes for all varieties of magnetic media including, videotapes, cassette tapes, etc.
REFERENCES:
patent: 2937241 (1960-05-01), Colbert
patent: 3535622 (1970-10-01), Cannon et al.
patent: 3755731 (1973-08-01), Young
patent: 4038692 (1977-07-01), Umeda et al.
patent: 4258397 (1981-03-01), Kitamura et al.
patent: 4806740 (1989-02-01), Gold et al.
patent: 4847558 (1989-07-01), Fisher et al.
Noise Correlation of Magnetic Thin Film Media by Mian, Indeck, and Muller. Japanese Journal of Applied Physics, vol. 30, No. 8B, Aug., 1991, pp. L1483-L1485.
Determination of a Track's Edge by Differential Power Spectrum by Indeck, Mian, and Muller. Jpn. J. Appl. Phys., vol. 31 (1992) pp. L1065-L1067.
Spatial Noise Phenomena of Longitudinal Magnetic Recording Media, by Hoinville, Indeck, Muller. IEEE Transactions on Magnetics, vol. 28, No. 6. Nov. 1992.
Measurements and Modeling of Noise in DC-Erased Thin-Film Media, by Vos, Tanaka, Jud. IEEE Transactions on Magnetics, vol. 26, No. 5, Sep. 1990.
Spatial Structure of Media Noise In Film Disks, Yarmchuk. IEEE Transactions on Magnetics, vol. Mag-22, No. 5, Sep. 1986.
Noise From Unsaturated DC Erasure and Peak Shift of Signals, Ohara, Sato. IEEE Transactions on Magnetics, vol. Mag-23, No. 5, Sep. 1987.
Novel Applications of Cryptography in Digital Communications, by Omura. IEEE Communications Magazine, pp. 21-29, May 1990.
A Physically Based Approach to Information Theory for Thin Film Magnetic Recording, by O'Sullivan, Porter, Indeck, Muller. Proceedings of the Thirtieth Allerton Conference on Communication, Control, and Computing, Oct. 1992.
Transverse Correlation Length in Thin Film Media, by Mian, Indeck, Muller. IEEE Transactions on Magnetics, vol. 28, No. 5, pp. 2733-2735, Sep. 1992.
A Magnetoresistive Gradiometer, by Indeck, Judy, Iwasaki. IEEE Transactions on Magnetics, vol. 24, No. 6, pp. 2617-2619, Nov. 1988.
An Analysis of Multilayered Thin-Film Magnetic Field Gradiometers Having a Superconducting Spacer, by Indeck. Journal of The Magnetics Society of Japan, vol. 13, Supplement, No. S1 pp. 599-604 (1989).
Interaction Factors of a Multi-Layered Magnetic Thin Film System, by Mian, Indeck. IEEE Transactions on Magnetics, vol. 26, No. 5, pp. 2415-2417, Sep. 1990.
An interaction matrix for the energy analysis of an n-layered magnetic thin-film system, by Mian, Indeck. Journal of Magnetism and Magnetic Materials, 96 (1991) 248-260.
dc track edge interactions, by Indeck, Reising, Hoinville, Muller. Journal of Applied Physics, 69 (8), pp. 4721-4723, 15 Apr. 1991.
Track edge fluctuations, by Muller, Indeck. Journal of Applied Physics, 67 (9), pp. 4683-4685, 1 May 1990.
In Situ Measurement of the Remanence Curve of Magnetic Recording Media, by Hoinville, Ornes, Murdock, Muller. IEEE Transactions on Magnetics, vol. 24, No. 6, pp. 2976-2978, Nov. 1988.
An in situ measurement of intergranular coupling in magnetic film media, by Mian, Indeck, Muller. Journal of Applied Physics, 73 (4), pp. 2027-2028, 15 Feb. 1993.
Noise Characterization of Perpendicular Media, by Indeck, Johnson, Mian, Hoinville, Muller. Journal of the Magnetics Society of Japan, vol. 15 Supplement, No. S2, pp. 173-178 (1991).
Authentication of Forensic Audio Recordings, by Koenig, Journal of the Audio Engineering Society, vol. 38, No. 1/2, pp. 3-33, 1990.
Indeck Ronald S.
Muller Marcel W.
Snow Walter E.
Washington University
LandOfFree
Method and apparatus for noise reduction in magnetic media recor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for noise reduction in magnetic media recor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for noise reduction in magnetic media recor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1180865