Look-ahead Sigma-Delta modulators look forward k samples before deciding to output a "one" or a "zero". The Viterbi algorithm is then used to search the trellis of the exponential number of possibilities that such a procedure generates. This paper describes alternative tree based algorithms. Tree based algorithms are simpler to implement because they do not require backtracking to determine the correct output value. They can also be made more efficient using "Stack" algorithms. Both the tree algorithm and the more computationally efficient "Stack" algorithms are described. Implementations of both algorithms are described in some detail. In particular, the appropriate data structures for both the trial filters and score memories.

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: 6281
Publication Date: October 1, 2004 Import into BibTeX
Subject: Signal Processing
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=12938

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