This paper presents a new a new method of applying high levels of dither to Sigma-Delta Modulators. In particular, it clarifies the position of the overload point in one-bit Sigma-Delta Modulation systems and presents several overload control methods with comparisons of their efficacy. It then goes on to examine the problem of applying dither to one-bit systems and describes a new approach for applying high levels of dither. It also examines the effect of different dither probability density distributions and shows that simple bi-level dither can be effective at lower levels than other probability density distributions. It presents results, which show that dither can be applied at a high enough level to be effective in one-bit Sigma-Delta Modulation systems.

Author: Angus, James A. S.
Affiliation: Acoustics Research Centre, Research Institute for the Built and Human Environment, University of Salford, Salford, Greater Manchester, England
AES Convention: 117 (October 2004) Paper Number: 6296
Publication Date: October 1, 2004
Subject: High Resolution Audio

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