Patent ID: 7038731

Claim:
A method for equalizing a data sequence in a high definition television system, and the data sequence comprises a plurality of original symbols, the method comprises the steps of: equalizing each original symbol of the data sequence with an equalization filter according to a group of parameters to obtain an equalized symbol; deriving an error value between the original symbol and the equalized symbol; and calculating a statistic error value of the data sequence for choosing a step size, determining an adjustment mode, and selecting a suitable erasure slicer, wherein the step size varies according to a first statistic error value of a data sequence, a second statistic error value of a previous data sequence, a first step size for the data sequence, a second step size for a next data sequence, a predetermined first value, a predetermined second value, a predetermined third value and a predetermined fourth value, wherein if the first statistic error value is larger than the second statistic error value multiplied by a value that is the first value plus one and the first step size plus the second value is not larger than the third value, the second step size is set to the first step size plus the second value; if the first statistic error value is larger than the second statistic error value multiplied by a value that is the first value plus one and the first step size plus the second value is larger than the third value, the second step size is set to the first step size; if the first statistic error value is not larger than the second statistic error value multiplied by a value that is the first value plus one, and the first statistic error value is smaller than the second statistic error value multiplied by a value that is one minus the first value, the second step size is set to the first step size; if the first statistic error value is not larger than the second statistic error value multiplied by a value that is the first value plus one, the first statistic error value is not smaller than the second statistic error value multiplied by a value that is one minus the first value, and the first step size minus the second value is not smaller than the fourth value, the second step size is set to the first step size minus the second value; and if the first statistic error value is not larger than the second statistic error value multiplied by a value that is the first value plus one, the first statistic error value is not smaller than the second statistic error value multiplied by a value that is one minus the first value, and the first step size minus the second value is smaller than the fourth value, the second step size is set to the first step size.