Variable digital filters

Ahuja, S. ; Roy, S. D. (1980) Variable digital filters IEEE Transactions on Circuits and Systems, 27 (9). pp. 836-838. ISSN 0098-4094

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IIR prototype filters cannot be used for the design of variable filters through Schussler's all-pass transformation because of the occurrence of delay-free loops; no such problem arises with FIR prototypes. In this paper, the drawbacks of the latter type, with regard to computational efficiency and output roundoff noise, have been brought out, An approach is suggested, wherein the delay-free loops with IIR prototypes are eliminated by modifying the coefficients of the first- and second-order sections of the prototype filter. The computation of modified coefficients In this approach requires fewer multiplications as compared to an existing method.

Item Type:Article
Source:Copyright of this article belongs to IEEE.
ID Code:92260
Deposited On:29 May 2012 12:26
Last Modified:29 May 2012 12:26

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