Title :
Some peculiar properties of the MDCT
Author :
Wang, Ye ; Yaroslavsky, Leonid ; Vilermo, Miikka ; Väänänen, Mauri
Author_Institution :
Nokia Res. Center, Tampere, Finland
Abstract :
Having established the interconnection between MDCT, SDFT (shifted discrete Fourier transform) and DFT, we have successfully applied the results in audio encoder design. This paper presents some new observations and analyses: (1) MDCT is not an orthogonal transform and this has an impact on audio coding, and (2) analysis of time domain alias cancellation (TDAC) during the window switching in the case of MPEG-2 AAC. Finally, we report some experimental results on the energy compaction properties of MDCT
Keywords :
audio coding; discrete Fourier transforms; interference suppression; time-domain analysis; transform coding; DFT; MDCT; MPEG-2 AAC; audio coding; audio encoder design; energy compaction properties; interconnection; orthogonal transform; shifted discrete Fourier transform; time domain alias cancellation; window switching; Attenuation; Audio coding; Compaction; Discrete Fourier transforms; Discrete cosine transforms; Discrete transforms; Frequency domain analysis; Sampling methods; Signal representations; Time domain analysis;
Conference_Titel :
Signal Processing Proceedings, 2000. WCCC-ICSP 2000. 5th International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-5747-7
DOI :
10.1109/ICOSP.2000.894444
