Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1981-08-10
1983-08-16
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 67, G11B 509, G11B 502
Patent
active
043994741
ABSTRACT:
A magnetic recorder including a playback circuit for decoding a ternary waveform digital data signal is disclosed, wherein positive and negative threshold levels, used to distinguish between signal levels representative of data ones from signal levels representative of data zeros, are automatically adjusted to compensate for occasional reductions in overall signal level that can occur due to dropouts and modulation noise on the magnetic medium. Two sample and hold units are used to generate an output signal whose amplitude reflects only those signal levels that are greater than some minimum absolute value. This output signal is filtered and then used to generate the compensated positive and negative threshold levels.
REFERENCES:
patent: 3478255 (1969-11-01), Parker et al.
patent: 3593334 (1971-07-01), Bickel
patent: 3735372 (1973-05-01), Coccagna
patent: 4219152 (1980-08-01), Couch et al.
K. Yokoyama, et al, "An Experimental Digital Videotape Recorder", SMPTE Journal, vol. 89, Mar. 1980, pp. 173-180.
Peter Kabal, et al, "Partial-Response Signaling", IEEE Transactions on Communications, vol. Com-23, No. 9, Sep. 1975.
H. Kobayashi, et al, "Application of Partial-Response Channel Coding to Magnetic Recording Systems", IBM J. Res. Develop., Jul. 1970, pp. 368-375.
Ampex Corporation
Canney Vincent P.
Flannery John
Strnad Elizabeth E.
Talcott Joel D.
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