Method and apparatus for processing digital audio signal

An apparatus for processing a digital audio signal having a sequence of samples having values representative of a waveform, comprising:

• means for comparing values of temporally adjacent samples to detect peak-corresponding samples which correspond to respective peaks including local maximums and local minimums in the waveform;
• means for estimating an ideal waveform peak from the value of each detected peak-corresponding sample and values of samples temporally adjacent to said detected peak-corresponding sample through interpolation;
• means for calculating a time interval between every two temporally adjacent estimated peaks;
• means for selecting one from coefficients in accordance with the calculated time interval;
• and
• means for correcting the value of each detected peak-corresponding sample and values of samples temporally adjacent to said detected peak-corresponding sample in response to the selected coefficient, the value of an estimated peak corresponding to said detected peak-corresponding sample, and a time position of said estimated peak.