TY - JOUR
T1 - Performance Analysis and Prototype Filter Design for Perfect-Reconstruction Cosine-Modulated Filter Banks With Fixed-Point Implementation
AU - Casey, Ryan B.
AU - Karp, Tanja
PY - 2005/8
Y1 - 2005/8
N2 - Cosine modulated filter banks have gained popularity for their ability to provide perfect reconstruction (PR) while maintaining an efficient design and implementation. However, this effectiveness is hindered if the filter bank is implemented in the fixed-point domain where quantization, rounding, and overflow occur, and result in reconstruction errors. In this article we demonstrate how to maintain PR of the filter bank when implementing it in fixed-point number format with constant wordlength. We explore how the frequency selectivity of the analysis and synthesis filters changes from the floating point ones due to fixed-point errors and present new design criteria for filter banks that will be implemented in fixed-point number format.
AB - Cosine modulated filter banks have gained popularity for their ability to provide perfect reconstruction (PR) while maintaining an efficient design and implementation. However, this effectiveness is hindered if the filter bank is implemented in the fixed-point domain where quantization, rounding, and overflow occur, and result in reconstruction errors. In this article we demonstrate how to maintain PR of the filter bank when implementing it in fixed-point number format with constant wordlength. We explore how the frequency selectivity of the analysis and synthesis filters changes from the floating point ones due to fixed-point errors and present new design criteria for filter banks that will be implemented in fixed-point number format.
KW - Cosine modulated filter banks
KW - fixed-point implementation
KW - perfect reconstruction (PR)
UR - http://www.scopus.com/inward/record.url?scp=33748491504&partnerID=8YFLogxK
U2 - 10.1109/TCSII.2005.850449
DO - 10.1109/TCSII.2005.850449
M3 - Article
AN - SCOPUS:33748491504
SN - 1549-7747
VL - 52
SP - 452
EP - 456
JO - IEEE Transactions on Circuits and Systems II: Express Briefs
JF - IEEE Transactions on Circuits and Systems II: Express Briefs
IS - 8
ER -