In this paper, an initial condition of a sigma-delta modulator is estimated based on quantizer output bit streams and an input signal. The set of initial conditions that generate a stable trajectory is characterized. It is found that this set, as well as the set of initial conditions corresponding to the quantizer output bit streams, are convex. Also, it is found that the mapping from the set of initial conditions to the stable admissible set of quantizer output bit streams is invertible if the loop filter is unstable. Hence, the initial condition corresponding to given stable admissible quantizer output streams and an input signal is uniquely defined when the loop filter is unstable, and a projection onto convex set approach is employed for approximating the initial condition.

Authors: Ho, Charlotte; Ling, Bingo Wing-Kuen; Reiss, Joshua D.
Affiliations: King's College London; Queen Mary, University of London(See document for exact affiliation information.)
AES Convention: 120 (May 2006) Paper Number: 6698
Publication Date: May 1, 2006
Session Subject: Signal Processing; High Resolution Audio

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