G - Physics – 11 – B
Patent
G - Physics
11
B
352/33.3
G11B 11/12 (2006.01) G11B 11/10 (2006.01) G11B 20/10 (2006.01) G11B 23/00 (2006.01)
Patent
CA 2039853
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 an 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 cancelling a DC component of the read analog signal, and adopting a 2,7NRZI method for recording and reproduction, enabling a high recording density to be achieved. The circuit further comprises a peak-detecting circuit for detecting and converting a peak of the read analog signal into digital data, and 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.
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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