Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Patent
1984-06-28
1987-01-06
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
360 46, G11B 545, G11B 509
Patent
active
046351434
ABSTRACT:
A waveform equalizer is arranged to transform a signal reproduced from a magnetic recording medium and having a longitudinal waveform component to a signal of a perpendicular waveform. The waveform equalizer comprises a tapped delay line having a first end connected to receive the reproduced signal and a second end arranged to reflect the reproduced signal, and a weighting adder for weighting tap voltages of the tapped delay line and adding together the weighted voltages. A combiner may be provided to additively or subtractively combine an output signal of the weighting adder with an output signal of either the tapped delay line or another delay line receiving the reproduced signal so as to transform a reproduced signal having both longitudinal and perpendicular waveform components to a signal with a longitudinal waveform or a perpendicular waveform. The second end of the tapped delay line may be short-circuited or connected to a resistor in order to reflect the signal.
REFERENCES:
patent: 3408640 (1968-10-01), Masson
patent: 4535417 (1985-08-01), Peacock
"Improvement of Recording Density by Means of Cosine Equalizer", T. Kameyama, S. Takanami and R. Arai, Nov. 1976, pp. 746-748.
"Phase Distortions of Signals in Magnetic Recording Equipment": Telecommunications Radio Engineering, V29-30, pp. 114-120; V. B. Minukhin; Oct. 1973.
"Phase Equalization for Perpendicular Recording": IEEE Trans. on Magnetics vol. Mag-18, No. 6, Nov. 1982; pp. 1247-1249; B. J. Langland.
Imamura Makoto
Suzuki Hiroshi
Canney Vincent P.
Kabushiki Kaisha Toshiba
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