Coherence as an Indicator of Distortion for Wide-Band Audio Signals such as M-Noise and Music

EasyChair Preprint 1445

Abstract

M-Noise is a new scientifically derived test signal whose crest factor as a function of frequency is modeled after real music. M-Noise should be used with a complementary procedure for determining a loudspeaker’s maximum linear SPL. The M-Noise Procedure contains criteria for the maximum allowable change in coherence as well as frequency response. When the loudspeaker and microphone are positioned as prescribed by the procedure, reductions in coherence are expected to be caused by distortion. Although higher precision methods for measuring distortion exist, coherence has the advantage that it can be calculated for wide-band signals such as M-Noise as well as music. Examples will demonstrate the perceived audio quality associated with different amounts of distortion-induced coherence loss.

Keyphrases: Crest factor, M-Noise, Magnitude squared coherence, Test Signal, coherence, distortion, distortion generator, distortion induced coherence loss, loudspeaker, m noise procedure, music, transfer function, wide-band signal

@booklet{EasyChair:1445,
  author    = {Merlijn van Veen and Roger Schwenke},
  title     = {Coherence as an Indicator of Distortion for Wide-Band Audio Signals such as M-Noise and Music},
  howpublished = {EasyChair Preprint 1445},
  year      = {EasyChair, 2019}}