Wavelet Based Pitch Extraction in the MPEG Compressed Domain

A technique to extract pitch information directly from audio files encoded using MPEG/Audio coding standard is described. The technique works in the compressed domain and requires the MPEG/Audio file to be decoded only partially for extracting the encoded subband samples. The paper first proposes a method for extracting wavelet coefficients from the subband samples. The pitch interval is then estimated from the time interval between two successive maxima of the wavelet coefficients. It is shown that the computational complexity for compressed domain pitch extraction is less than 7% of the computations required for decoding the subband samples and finding the pitch