SIGNAL REPRODUCING METHOD FOR COMPENSATING CHANNEL DISTORTION AND DEVICE THEREFOR

摘要

PURPOSE: A signal reproducing method for compensating a channel distortion and a device therefor are provided to detect a section having the most errors for signals to be reproduced, and to calculate a distortion amount in the detected section to perform error correction, so as to reduce complexity of hardware and software and enhance correctness in error correction. CONSTITUTION: A maximum error generating area is decided from signals(y(k)) passing a channel(600). Whether the multiplication of signals y(n) and y(n-1) at two sampling points is not more than 0(zero) is decided to detect level transition(602). If so, level transition is decided to be generated and a transition frequency is checked(604). If the transition frequency is not more than a predetermined frequency(j), a predetermined reference signal is modeled(606). If the transition frequency is more than (j), a value adding a previously calculated final distortion amount to the reference signal calculated as in the 606 step is set as a reference signal(608). Plural error paths are detected for the signals of a maximum error generating area(610). Differences between signals in each error path and the reference signal coinciding with a level transition direction of the error paths are calculated, and an error path having the smallest absolute value from the differences is detected as an optimum error path(612). If the transition frequency is less than (j), an absolute value of a difference between an optimum error path signal and the reference signal is stored as a distortion amount(614). If the transition frequency is equal to (j), distortion amounts stored in the 614 step and current distortion amounts are added and averaged to calculate a final distortion amount(616). Error correction is performed for signals on the optimum error path(618). And the error-corrected signals are restored to original signals(620).