Minimisation of computation for digital controllers

R. M. Goodall

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


A novel Structure is described and analysed which has a number of advantages for the practical implementation of recursive digital filters in control applications. It is based upon the use of an established alternative to the usual z-1 delay operator, but this has been developed into a standard form called a δ filter which is both robust and versatile. The advantages are shown to be in the simplicity of implementation, including the determination of word-lengths for the coefficients and variables. First- and second-order filter structures are given in detail, and simulations presented to demonstrate the operation of a few typical filters. Significant reductions in computation requirements are possible using the δ filter.

Original languageEnglish
Pages (from-to)218-224
Number of pages7
JournalTransactions of the Institute of Measurement & Control
Issue number5
Publication statusPublished - 1 Dec 1989
Externally publishedYes


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