Digital filter sampling using non-uniform sampling

Busawon, Krishna and Ng, Wai Pang (2007) Digital filter sampling using non-uniform sampling. In: AEE'07 Proceedings of the 6th conference on Applications of electrical engineering. World Scientific and Engineering Academy and Society (WSEAS), Wisconsin, USA, pp. 120-124. ISBN 978-9608457744

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In this paper, a non-uniform sampling algorithm is proposed for one-dimensional bandlimited time varying signals. The main feature of the proposed sampling scheme is that the sampling steps are inversely proportional to signal gradient or slope of the signal. As a result, a smaller sampling step is obtained whenever the gradient is high and vice-versa. Thus, a better representation of the signal is obtained when it is linearly interpolated between the samples. The proposed sampling algorithm is then applied to the design of digital filters using the well-known impulse invariance method. It is shown that the nonuniform sampling allows to design a FIR filter whose length is 14 times shorter than what is obtained with uniform sampling; with both filters having similar characteristiscs. Simulations are provided to show the performance and characteristics of the sampling sequence.

Item Type: Book Section
Subjects: H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Sarah Howells
Date Deposited: 22 Nov 2012 09:43
Last Modified: 13 Oct 2019 00:23

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