On the relationship between MDCT, SDPT and DFT

Author

Wang, Ye ; Yaroslavsky, Leonid ; Vilermo, Miikka

Author_Institution

Nokia Res. Center, Tampere, Finland

Volume

1

fYear

2000

fDate

2000

Firstpage

44

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Proceedings, 2000. WCCC-ICSP 2000. 5th International Conference on

Conference_Location

Beijing

Print_ISBN

0-7803-5747-7

Type

conf

DOI

10.1109/ICOSP.2000.894440

Filename

894440