The Performance of Look-Ahead Sigma-Delta Modulators with Unstable Noise Shaping Filters

Angus JAS, Hoare S. The Performance of Look-Ahead Sigma-Delta Modulators with Unstable Noise Shaping Filters. In: AES Convention 121. Audio Engineering Society; 2006. Paper 6865. Available from: https://aes.org/publications/elibrary-page/?id=13699

@inproceedings{Angus2006_13699,
  author = {Angus, Jamie A. S. and Hoare, Steve},
  title = {{The Performance of Look-Ahead Sigma-Delta Modulators with Unstable Noise Shaping Filters}},
  booktitle = {AES Convention 121},
  note = {Paper 6865},
  year = {2006},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=13699}
}

TY  - CPAPER
TI  - The Performance of Look-Ahead Sigma-Delta Modulators with Unstable Noise Shaping Filters
AU  - Angus, Jamie A. S.
AU  - Hoare, Steve
T2  - AES Convention 121
M1  - Paper 6865
PY  - 2006
DA  - 2006/10/06
UR  - https://aes.org/publications/elibrary-page/?id=13699
PB  - Audio Engineering Society
LA  - en
AB  - Look-ahead Sigma-Delta modulators look forward k samples before deciding to output a “one” or a “zero”. We look at the performance of such modulators, when used with unstable noise shaping filters, and examine the trade-off between the number of paths that must be kept alive, and the look-ahead depth needed, to assure stability. Such information helps define the number of required paths in a “Pruned Tree” algorithm or the stack size in a “Stack” algorithm, as well as the minimum search depth required. Results are presented showing that an unstable noise-shaping filter, with an out-of-band gain of 3.0, can be used successfully. This gives a 10-12 dB improvement in signal-to-noise ratio, compared to a conventional modulator.
ER  -