Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1989-01-27
1992-03-10
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
360 32, G11B 509, G11B 500
Patent
active
050953923
ABSTRACT:
A digital signal magnetic recording/reproducing apparatus converts a digital signal into multi-value digital signals and performs recording/reproducing of a multi-value quadrature amplitude-modulated signal. By using the multi-value quadrature amplitude modulation, it is possible to remove the DC component in the recording signal and improve the utilization efficiency of the recording frequency band. Further, using a system to memorize the frequency characteristic of the magnetic recording/reproducing unit and effect Viterbi decoding regarding the intersymbol interference caused by the frequency as a convolutional coding, it is possible to detect the level without necessitating frequency equalization. Accordingly, there arises no deterioration of the S/N ratio by frequency equalization. Furthermore, by providing an encoder for error control coding by increasing the number of multi-values and a corresponding decoder, the error rate can be improved against the deterioration of the S/N ratio. Further, by bias recording the multi-value quadrature amplitude modulated signal, non-linearity of the electromagnetic conversion system is relaxed, and deterioration of the S/N ratio by distortion is improved.
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Kobayashi Masa-aki
Matsuta Toyohiko
Shimazaki Hiroaki
Shimotashiro Masafumi
Matsushita Electric - Industrial Co., Ltd.
Psitos Aristotelis
Sheladir Varsha V.
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