Dynamic magnetic information storage or retrieval – General processing of a digital signal – In specific code or form
Patent
1982-07-02
1985-01-22
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
In specific code or form
360 46, G11B 509
Patent
active
044955286
ABSTRACT:
A magnetic reproducing system reproduces a recording two-valued code signal from a magnetic recording medium, and detects the signal level of the reproduced signal to reproduce a digital signal of a desired two-valued code, where the recording two-valued code signal is obtained by passing the digital signal of the above desired two-valued code through a converter and a delay circuit and then feeding back this digital signal to carry out a modulo-2 addition. The magnetic recording medium is recorded with the above recording two-valued code signal. The magnetic reproducing system comprises a magnetic head for reproducing the two-valued code recorded on the magnetic recording medium, an equalizer for performing wave-equalization of the signal reproduced by the magnetic head, and a signal detection circuit for detecting the signal level of a three-valued code signal obtained from the above equalizer, to produce a two-valued detection signal in which signal levels corresponding to "+1" and "-1" of the three-valued code signal is set to a signal level "+1" and a signal level corresponding to "0" of the three-valued code signal is set to a signal level "0", as a reproduced output signal of the digital signal.
REFERENCES:
patent: 3585314 (1971-06-01), Korn
patent: 4234898 (1980-11-01), Nakagawa et al.
patent: 4367495 (1983-01-01), Mita et al.
Moriyama Masaru
Sasamura Kohhei
Canney Vincent P.
Victor Company of Japan Ltd.
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