Dynamic magnetic information storage or retrieval – General processing of a digital signal
Patent
1994-01-07
1995-03-28
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
360 24, 360 29, 360 40, G11B 509, G11B 2010, G11B 502
Patent
active
054022720
ABSTRACT:
A digital signal magnetic recording/reproducing apparatus subjects a digital signal to a digital amplitude phase shift keying and records and reproduces the modulated signal thus obtained on a magnetic recording medium. Use of the digital amplitude phase shift keying technique makes it possible to remove the direct-current component in the recording signals, and to improve the utilization efficiency of the recording frequency band, thus making high density recording possible. In addition, since a plurality of modulated signals are frequency-multiplexed and recorded, almost the entire frequency band recordable on a magnetic recording medium can be utilized, resulting in an increase in recording density. Further in addition, a pilot signal produced by frequency-converting a carrier is frequency-multiplexed with a modulated signal and recorded and reproduced and the carrier is reproduced from the reproduced pilot signal, so that a redundant part for reproducing the carrier is not necessary.
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Kobayashi Masa-aki
Nakatsu Etsuto
Ohta Haruo
Matsushita Electric - Industrial Co., Ltd.
Pearson Jennifer Gnann
Psitos Aristotelis
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