Abstract
In chapter ten, the Pruned Tree sigma-delta modulation algorithm for Super Audio CD (SA-CD) is presented. The algorithm has a better compatibility with Super Audio CD, because it generates bitstreams that result in a high lossless data compression gain. This is achieved by adding a cost function to the look-ahead filter that measures the predictability of the output signal. This addition results in an output bitstream that is of a high signal quality, but that is also very predictable, such that the amount of required disc storage space after lossless data compression reduces. This reduction of the required storage space is of great importance, since it solves potential playback duration issues. The addition of the prediction cost function has only a minimal impact on the SNR, while the distortion and the noise-modulation performance of the converter are strongly reduced, resulting in the ideal sigma-delta converter for high-end audio applications.
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Notes
- 1.
A sine wave with a peak amplitude of 50% of the theoretical maximum has a level of 0 dB SACD, see annex D.2 of the Scarlet book. Normalized to a feed-back value of ±1.0 this reflects to an amplitude of 0.5.
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Janssen, E., van Roermund, A. (2011). Pruned Tree Sigma-Delta Modulation for SA-CD. In: Look-Ahead Based Sigma-Delta Modulation. Analog Circuits and Signal Processing. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-1387-1_10
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