Data detecting apparatus and method thereof
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorHaruo Ohta
Life of this patent
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Abstract
A data detecting method and its apparatus for equalizing an input signal reproduced from magnetic recording media by partial response by employing at least one of partial response class 4 (PR4) and extended partial response class 4 (EPR4), and decoding the input signal. The input signal is equalized by PR4, and a first equalized signal is obtained. First decoded data is obtained from the first equalized signal. The input signal is equalized by EPR4, and a second equalized signal is obtained. Second decoded data is obtained from the second equalized signal. From the first equalized signal and second equalized signal, the signal condition of the input signal is judged, and the optimum data detecting method is discriminated. Thus, either the first decoded data or second decoded data is selected as detected data.
Claims16
A data detecting apparatus for equalizing an input signal by partial response by employing at least one of partial response class 4 (PR4) and extended partial response class 4 (EPR4), and decoding the input signal, comprising:
- (a) first equalizing means for equalizing the input signal by PR4, and generating a first equalized signal;
- (b) first decoding means for decoding the first equalized signal and obtaining first decoded data;
- (c) second equalizing means for equalizing the input signal by EPR4, and generating a second equalized signal;
- (d) second decoding means for decoding the second equalized signal and obtaining second decoded data;
- (e) condition discriminating means for discriminating the signal condition of the first equalized signal and second equalized signal, judging the optimum data detecting method, and generating a condition discriminating signal;
- and
- (f) selecting means for selecting one of the first decoded data and the second decoded data based on the condition discriminating signal, so as to obtain detected data.
A data detecting method for equalizing an input signal by partial response by employing at least one of partial response class 4 (PR4) and extended partial response class 4 (EPR4), and decoding the input signal, comprising the steps of:
- (a) equalizing the input signal by PR4, and obtaining a first equalized signal;
- (b) obtaining first decoded data from the first equalized signal;
- (c) equalizing the input signal by EPR4, and obtaining a second equalized signal;
- (d)obtaining second decoded data from the second equalized signal;
- (e)discriminating the signal condition of the first equalized signal and second equalized signal, judging the optimum data detecting method, and generating a condition discriminating signal;
- and
- (f) selecting one of the decoded data and second decoded data based on the condition discriminating signal issued at said step (e), so as to obtain detected data.
A data detecting method for equalizing an input signal by partial response by employing at least one of partial response class 4 (PR4) and extended partial response class 4 (EPR4), and decoding the input signal, comprising the steps of:
- (a) equalizing the input signal by PR4, and obtaining a first equalized signal;
- (b)equalizing the input signal by EPR4, and obtaining a second equalized signal;
- (c)judging the signal condition of the first equalized signal and second equalized signal, discriminating the optimum data detecting method, and generating a condition discriminating signal;
- (d)obtaining the first decoded data from the first equalized signal when the condition discriminating signal judges that the first decoded data is optimum, and stopping the step of obtaining the second decoded data from the second equalized signal;
- and
- (e)obtaining the second decoded data from the second equalized signal when the condition discriminating signal judges that the first decoded data is not optimum, and stopping the step of obtaining the first decoded data from the first equalized signal.
Dependencies are inferred from the claim text.