Information read device and read signal processing circuit

Details Information read device and read signal processing circuit Information read device and read signal processing circuit

2011-05-17

2011-05-17

Tran, Khanh C (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

07945002

ABSTRACT:
An information read device enabling obtaining of a data pattern recorded on an information recording medium as a readout signal, includes an analog to digital converter for converting the readout signal to a digital signal for a predetermined clock, a phase locked loop circuit that supplies the clock used in the analog to digital converter, a first FIR filter for equalizing the digital-converted digital signal under a first equalization condition, a Viterbi decoder to decode outputs of the FIR filter into binary data, wherein the phase locked loop circuit enables detection of a cycle slip of the phase locked loop circuit, and a detector which detects the cycle slip of the phase locked loop circuit. The FIR filter returns tap coefficients of the FIR filter, and the Vitabi decoder returns a target level of a decode operation to an initial value when an out-breaking of the cycle slip occurs.

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