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A new statistical approach to the coefficient word length problem for digital filters

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1 Author(s)

A statistical approach is proposed for estimating the necessary coefficient word length of a digital filter. With this statistical word length definition, an optimization procedure is then proposed for minimizing the statistical word length for a given filter structure and a given set of maximum error constraints. It is shown that by minimizing this statistical word length, the actual coefficient word length upon rounding of the coefficients can generally be reduced as well. Several examples are given and improvements of one to three bits in the actual coefficient word length are observed. The procedure does not necessarily lead to the actual global minimum coefficient word length.

Published in:

Circuits and Systems, IEEE Transactions on  (Volume:22 ,  Issue: 3 )

Date of Publication:

Mar 1975

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