INTERPOLATION CIRCUIT FOR INTERPOLATING ERROR DATA BLOCK GENERATED IN ( ) MODULATED DATA STREAM, REPRODUCING APPARATUS OR STORAGE APPARATUS ADAPTED FROM INTERPOLATION CIRCUIT, AND METHOD FOR INTERPOLATION

摘要

AN INTERPOLATION CIRCUIT AND A RECORDING AND/OR REPRODUCING APPARATUS CARRYING THE INTERPOLATION CIRCUIT ARE DISCLOSED. THE INTERPOLATING CIRCUIT CALCULATES AN AVERAGE VALUE OF DATA POSITIONED UPSTREAM AND DOWNSTREAM OF A DEFECTIVE DATA PORTION GENERATED IN A DATA STRING BY AN FIR FILTER HAVING PRE-SET COEFFICIENT VALUES, AND CALCULATES INTERPOLATED DATA FROM THE AVERAGE VALUE. THE INTERPOLATION CIRCUIT ALSO CALCULATES AN AVERAGE VALUE OF DATA CONTAINING THE DEFECTIVE DATA PORTION USING THE FIR FILTER AND CALCULATES THE DIFFERENCE FROM THE INTERPOLATED DATA FOR ESTIMATING THE ARRAYING PATTERN OF THE DEFECTIVE DATA PORTION. THE INTERPOLATION CIRCUIT THEN DETERMINES AN OPTIMUM ARRAY IN THE ESTIMATED ARRAYING PATTERN AND SUBSTITUTES THE OPTIMUM ARRAY FOR THE DEFECTIVE DATA FOR REPAIRING THE DEFECTIVE DATA.