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Design of 2-D digital filters with finite wordlength coefficients

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2 Author(s)
Wan, Y. ; Dept. of Electr. Eng., Queen''s Univ., Kingston, Ont., Canada ; Fahmy, M.M.

A new design technique for 2-dimensional (2-D) IIR digital filters is developed. Instead of using optimal step size in the j-th iteration of Fletcher-Powell algorithm, a suboptimal step size is used to increase the overall computation efficiency. Criteria are developed for suboptimal step size to keep the mapping matrix Dj positive definite (PD) and to ensure the stability of the transfer function. The approach does not require checking the positive definiteness of Dj or the filter stability in each iteration. A new optimization algorithm with finite wordlength coefficients is developed. The algorithm minimizes the performance error caused by truncating the filter coefficients to a specified number of bits. An example of 2-D digital filters is designed by the new method

Published in:

Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on

Date of Conference:

11-14 Apr 1988