Measurement of the Rate of Change Distortions in Loudspeaker System

Loudspeaker system distorts transients signals of speech and music. Normalized rate of change (NRC) of reproduced sound pressure depends of spatial ratio between sound source and listener's ear, and spectrum and amplitude of reproduced signal. To measure dynamic nonlinear distrotions of loudspeaker composed audio test signal was developed, which has similar characteristics as speech and music. Rate of change of the reproduced signal was measured statistically with help of probability density function (PDF).