Title :
Efficient implementation of real filter banks using frequency response masking techniques
Author :
Lee, J.W. ; Lim, Y.C.
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore
Abstract :
The fast filter bank (FFB) is a single-rate filter bank based on the frequency response masking technique and has very sparse filter coefficients. As a result, it has very low computational complexity. However, the output of the filter bank is complex. In this paper, a method is proposed to reduce the FFB, if the input and output signals are real. This involves complex modulation at selected nodes throughout the filter bank. The overall savings achieved are substantial.
Keywords :
computational complexity; digital filters; fast Fourier transforms; filtering theory; frequency response; modulation; FFB reduction; complex filter bank output; complex modulation; computational complexity; fast filter bank; filter bank nodes; frequency response masking techniques; real filter bank implementation; real input signals; real output signals; single-rate filter bank; sliding FFT operation; sparse filter coefficients; Attenuation; Bandwidth; Channel bank filters; Computational complexity; Filter bank; Finite impulse response filter; Frequency response; Prototypes; Signal analysis; Transfer functions;
Conference_Titel :
Circuits and Systems, 2002. APCCAS '02. 2002 Asia-Pacific Conference on
Print_ISBN :
0-7803-7690-0
DOI :
10.1109/APCCAS.2002.1114910
