Dynamic information storage or retrieval – Binary pulse train information signal – Binary signal gain processing
Patent
1991-04-03
1994-05-10
Young, W. R.
Dynamic information storage or retrieval
Binary pulse train information signal
Binary signal gain processing
369 48, 369124, 360 41, G11B 700
Patent
active
053114930
ABSTRACT:
A data reproduction circuit for converting a read analog signal into digital data corresponding to recording data, has a second order differential circuit for emitting a second order differentiated signal of the read analog signal read from a data recording medium, an inverter for generating a comparative voltage that is switched between a plurality of levels, and a comparator for comparing the second order differentiated signal and the comparative voltage to release digital data. This permits to cancel a DC component of the read analog signal and to adopt a 2,7 NRZI method for recording and reproduction enabling to achieve a high recording density. The circuit further comprises a peak detecting circuit for detecting and converting a peak of the read analog signal into digital data, and that has a first order differential circuit for emitting a first order differentiated signal of the read analog signal, a three-state inverter for generating a second comparative voltage that is switched between a plurality of levels, and a comparator for comparing the first order differentiated signal and the second comparative voltage to release digital data. The circuit may thus be adopted for both RZ and NRZI methods.
REFERENCES:
patent: 4755950 (1988-07-01), Yoshimaru et al.
patent: 4954903 (1990-09-01), Fuji et al.
Edun Muhammad
Sharp Kabushiki Kaisha
Young W. R.
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