Tonality index of sigma-delta modulators: A Psychoacoustics model based approach

Abstract

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