Method and apparatus of binarizing input signal, disc driver and recording medium
First Claim
1. A method of binarizing an input signal, comprising:
- viterbi-decoding the input signal;
slicing the input signal based on a predetermined reference level;
comparing the viterbi-decoded signal with the sliced signal;
determining which of the viterbi-decoded signal and the sliced signal to perform processing on so as to obtain an offset of the input signal, the determining being based on relative characteristics of the viterbi-decoded signal and the sliced signal;
obtaining an offset of the input signal; and
correcting the offset of the input signal based on the obtained offset;
wherein the viterbi-decoded signal is a binary signal of the input signal.
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Accused Products
Abstract
A method and an apparatus are provided for binarizing an input signal, which is capable of reliably correcting an offset of the input signal even when the input signal does not reach a reference level or has a single frequency, a disc driver and a recording medium. The binarizing method includes viterbi-decoding the input signal to obtain a viterbi-decoded signal; slicing the input signal based on a predetermined reference level to obtain a sliced signal; obtaining an offset of the input signal by low-pass filtering the viterbi-decoded signal or the sliced signal; and correcting the offset of the input signal based on the obtained offset. The viterbi-decoded signal is a binary signal of the input signal.
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Citations
19 Claims
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1. A method of binarizing an input signal, comprising:
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viterbi-decoding the input signal; slicing the input signal based on a predetermined reference level; comparing the viterbi-decoded signal with the sliced signal; determining which of the viterbi-decoded signal and the sliced signal to perform processing on so as to obtain an offset of the input signal, the determining being based on relative characteristics of the viterbi-decoded signal and the sliced signal; obtaining an offset of the input signal; and correcting the offset of the input signal based on the obtained offset; wherein the viterbi-decoded signal is a binary signal of the input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 14, 15, 16, 17, 18, 19)
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8. An apparatus to binarize an input signal, comprising:
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a viterbi-decoder to viterbi-decode the input signal; a slicer to slice the input signal based on a predetermined reference level; a selector to select which of the output of the viterbi-decoder and the output of the slicer to filter, the selecting being based on relative characteristics of the output of the viterbi-decoder and the output of the slicer; a low pass filter module to low-pass filter the selected signal output from the selector; an offset correcting module to remove an output signal of the low pass filter module from the input signal, to correct an offset of the input signal, and to supply the input signal with the corrected offset to the viterbi decoder and the slicer; wherein the output signal of the viterbi decoder is a binary signal of the input signal. - View Dependent Claims (9, 10, 11)
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12. A disc driver having a function of binarizing an RF (radio frequency) signal read from a disc, the disc driver comprising:
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a viterbi decoder to viterbi-decode the RF signal read from the disc; a slicer to slice the RF signal using a predetermined reference level; a selector that select which of the output of the viterbi-decoder and the output of the slicer to filter, the selecting being based on relative characteristics of the output of the viterbi-decoder and the output of the slicer;
a low pass filter module to low-pass filter the selected signal output from the selector;
an offset correcting module to remove a signal output from the low pass filter module from the RF signal, to correct an offset of the RF signal, and to provide the RF signal with the corrected offset to the viterbi decoder and the slicer;wherein the signal output from the viterbi decoder is a binary signal of the RF signal.
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13. A non-transitory computer-readable recording medium having embodied thereon a computer program to perform a method of binarizing an input signal, the method comprising:
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viterbi-decoding the input signal to obtain a viterbi-decoded signal; slicing the input signal based on a predetermined reference level to obtain a sliced signal; comparing the viterbi-decoded signal with the sliced signal; determining which of the viterbi-decoded signal and the sliced signal to perform processing on so as to obtain an offset of the input signal, the determining being based on relative characteristics of the viterbi-decoded signal and the sliced signal;
low-pass filtering the viterbi-decoded signal or the sliced signal to obtain an offset of the input signal; andcorrecting the offset of the input signal using the obtained offset; wherein the viterbi-decoded signal is a binary signal of the input signal.
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Specification