Tonality Index of Sigma-Delta Modulators : A Psychoacoustics Model Based Approach

This paper details the development of an enhanced accuracy tonality index for Delta-Sigma modulators that use psychoacoustic techniques. This tonality measure is especially relevant for quantifying Delta-Sigma modulators for performance of audio applications where the output spectra contain low amplitude tones. This tonality index is very useful for the design and evaluation of Delta-Sigma modulators circumventing the need to build a modulator prototype and undertake detailed listening tests.