Improved algorithm for efficient computation of the forward and backward MDCT in MPEG audio coder

Author

Lee, Szu-Wei

Author_Institution

Intervideo Int. Inc., Taichung, Taiwan

Volume

48

Issue

10

fYear

2001

fDate

10/1/2001 12:00:00 AM

Firstpage

990

Lastpage

994

Abstract

Britanak and Rao (see IEEE Signal Processing Lett., vol. 8, p. 48-51, Feb. 2001) recently proposed an efficient algorithm to implement the forward and backward modified discrete cosine transform (MDCT) in MPEG layer III. This algorithm employs discrete cosine transform of type II (DCT-II) and discrete sine transform of type II (DST-II) to compute the forward MDCT, and uses their inverses to compute the backward MDCT. The author presents an improved algorithm to implement the forward and backward NEXT in MPEG layer III. Notably, the proposed algorithm requires less calculation than Britanak and Rao´s algorithm does. Furthermore, it employs the same module to compute both the forward and backward MDCT. Thus, when compared to the former algorithm, the proposed algorithm is implemented more easily

Keywords

audio coding; code standards; computational complexity; data compression; discrete cosine transforms; DCT-II; DST-II; MPEG audio coder; MPEG layer III; audio signals; backward modified DCT; complexity reduction; discrete sine transform; efficient computation; forward modified DCT; modified discrete cosine transform; Artificial intelligence; CMOS analog integrated circuits; CMOS digital integrated circuits; CMOS process; Cathode ray tubes; Circuit synthesis; Frequency synthesizers; Read only memory; Signal synthesis; Writing;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.974789

Filename

974789