期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2014
卷号：12
期号：3
页码：136-140
DOI：10.14445/22312803/IJCTT-V12P127
出版社：Seventh Sense Research Group
摘要：A method is proposed for the direct conversion of MDCT coefficient to DFT coefficients and it is valid for any pair of MDCT & DFT for different window functions like Blackman, tukey, Bartlett. Here we decompose the matrix i.e., MDCT to DFT conversion in to a Toeplitz part plus a Hankel part. Splitting, mirroring, and combining with the above conversion matrix we can construct a global Toeplitz matrix; which leads to a fast FIR filtering implementation of the total conversion procedure. The filter taps are DFT coefficients of window function products and concentrate most of their energy in a few low frequency taps. Thus by keeping a few significant no of taps we can efficiently approximate the conversion matrix.
关键词：MDCT; DFT; Toeplitz part matrix; Hankel part matrix; global toeplitz matrix; filter taps.
