Title :
On the relationship between MDCT, SDPT and DFT
Author :
Wang, Ye ; Yaroslavsky, Leonid ; Vilermo, Miikka
Author_Institution :
Nokia Res. Center, Tampere, Finland
Abstract :
The modified discrete cosine transform (MDCT) has emerged as a dominant time-frequency decomposition method in high quality audio compression. The MDCT is a special case of the lapped transforms (LTs) with 50% overlap. This paper establishes the relationship between the MDCT and shifted discrete Fourier transform (SDFT). The analysis provides insight into the following issues: (1) the relationship between MDCT, shifted DFT (SDFT) and DFT, (2) characteristics of the MDCT in the time and frequency domain, (3) the concept of time domain aliasing cancellation (TDAC)
Keywords :
audio coding; data compression; discrete Fourier transforms; discrete cosine transforms; time-frequency analysis; transform coding; DFT; MDCT; SDPT; frequency domain; high quality audio compression; lapped transforms; modified discrete cosine transform; shifted DFT; shifted discrete Fourier transform; time domain aliasing cancellation; time-frequency decomposition method; Audio compression; Compaction; Discrete Fourier transforms; Discrete cosine transforms; Discrete transforms; Psychoacoustic models; Psychology; Quantization; Time domain analysis; Time frequency 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.2000.894440
