Dynamic magnetic information storage or retrieval – Converting an analog signal to digital form for recording;...
Patent
1988-09-29
1990-12-18
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Converting an analog signal to digital form for recording;...
360 40, G11B 500, G11B 509
Patent
active
049790528
ABSTRACT:
A digital signal magnetic recording/reproducing apparatus converts a digital signal into a multi-value quadrature amplitude modulated signal, and records and reproduces the multi-value quadrature amplitude modulated signal. By using the multi-value quadrture amplitude modulation, any DC component in the recording signal is removed and utilization efficiency of the recording frequency band can be improved. By bias recording of the multi-value quadrature amplitude modulated signal, non-linearity of the electromagnetic of conversion system is reduced, and deterioration of SN ratio due to distortion is improved.
REFERENCES:
patent: 4633330 (1986-12-01), Yamamitsu et al.
patent: 4864421 (1989-09-01), Morioka et al.
"An Experimental Digital Video Recording System", L. Driessen, Cr 21, IEEE Transactions on Consumer Electronics, vol. CE-32, #3, 8/86.
"An Experimental Digital VTR Capable of 12-Hour Recording" by C. Yamamitsu, A. Ide, T. Juri in IEEE Transactions on Consumer Electronics, vol. CE-33, No. 3, Aug., 1987.
"Digital Television Recording with Low Tape Consumption" by John L. E. Baldwin, copyright 1978, 1979 by the Institution of Electrical Engineers.
"Signal System Design for a Digital Video Recording System" by Luigi Gallo in SMPTE Journal, vol. 86, Oct., 1977.
"An Analytical Approach to the Standardization of Digital Videotape Records" by Jurgen K. R. Heitmann, SMPTE Journal, Mar., 1982.
"Digital Video Recording: New Results in Channel Coding and Error Protection" by Jurgen K. R. Heitmann, in SMPTE Journal, Feb., 1984.
Kobayashi Masa-aki
Matsuta Toyohiko
Shimotashiro Masafumi
Canney Vincent P.
Matsushita Electric - Industrial Co., Ltd.
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