Application of frequency-response masking technique to the design of a novel modified-DFT filter bank

2006 ◽  
Author(s):  
Nan Li ◽  
B. Nowrouzian
Keyword(s):  
Frequency Response ◽  
Filter Bank ◽  
Frequency Response Masking

EFFICIENT DESIGN OF NARROWBAND COSINE-MODULATED FILTER BANKS USING A TWO-STAGE FREQUENCY-RESPONSE MASKING APPROACH

2003 ◽  
Vol 12 (05) ◽  
pp. 631-642 ◽  
Author(s):  
SERGIO L. NETTO ◽  
LUIZ C. R. de BARCELLOS ◽  
PAULO S. R. DINIZ
Keyword(s):  
Computational Complexity ◽  
Frequency Response ◽  
Filter Bank ◽  
Filter Banks ◽  
Efficient Design ◽  
Arithmetic Operations ◽  
Two Stage ◽  
Minimax Method ◽  
Frequency Response Masking ◽  
Frm Approach

A new cosine-modulated filter bank (CMFB) structure is proposed based on the frequency-response masking (FRM) approach using masking filter decomposition. The resulting structure, the so-called FRM2-CMFB, presents reasonable computational complexity (number of arithmetic operations per output sample) and allows one to design filter banks with extremely large number of bands. The examples include the use of M=1024 bands, where the standard minimax method cannot be employed. These examples indicate that the reduction in computational complexity can be as high as 60% of the original FRM-CMFB structure, which does not use masking filter decomposition.

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