Title :
A fast algorithm for modified discrete cosine transform
Author :
Wang Jlanxin ; Zaiwang, Dong
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
This paper presents a fast algorithm for modified discrete cosine transform (MDCT), which is widely used in the coding of wide-band audio signals. By simple time shift and reverse, the MDCT is computed using Lee´s (1984) fast cosine transform (FCT). The number of real multiplications is reduced from 2N2 to (N/2)log2N+N, half of that of the FFT based algorithm. The algorithm renders a simple and symmetric structure
Keywords :
audio coding; audio signals; discrete cosine transforms; transform coding; audio coding; fast algorithm; fast cosine transform; modified discrete cosine transform; multiplications; symmetric structure; time reverse; time shift; wideband audio signals; Design engineering; Discrete cosine transforms; Electronic mail; Equations; Image coding; Kernel; Signal design; Signal processing algorithms; Signal synthesis; Wideband;
Conference_Titel :
Communication Technology Proceedings, 1996. ICCT'96., 1996 International Conference on
Conference_Location :
Beijing
Print_ISBN :
0-7803-2916-3
DOI :
10.1109/ICCT.1996.545218
