Document Type

Technical Report

Publication Date

2003-05-01

Filename

wucse-2003-30.pdf

Technical Report Number

WUCSE-2003-30

Abstract

This thesis examines the effects of changing the numerical representation of audio signals in digital hearing aids to minimize power consumption. Within the hearing aid design a majority of the power used is consumed in the many finite impulse response filters. The main processing involved in these filters is a multiply-accumulate function. We examine the power consumption of 12 different multiply-accumulate units that use the following numerical representations: a 16-bit linear representation, a 9-bit logarithmic representation, and 10 different floating-point rep-representations ranging from 9 to 13 bits. A selection of the multiply-accumulators are simulated using a continuous-circuit simulator. The power estimates from this are compared with signal transition counts from a discrete event simulator to quantify the relationship between transition counts and power consumption. This relationship is then used to examine other numerical representations.

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Permanent URL: http://dx.doi.org/10.7936/K7Z60MDT

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