Integer wavelet transforms based lossless audio compression

In this paper we propose the use of integer wavelet [2] as a decorrelation stage for adaptive context based lossless audio coding. The original wideband audio signal is first decomposed in wavelet subbands. The resulted coefficients are integer valued and therefore can be transmitted using an adaptive context based method, in a lossless manner, the decoder being able to reconstruct them and afterwords to perfectly restore the audio waveform. Several ways to encode the integer wavelet coefficients are explored and the results are compared with those obtained in fullband contex adaptive coding.