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Testing Loudspeakers with Wavelets

A shaped sine burst wavelet is very effective for revealing audible loudspeaker distortion. The same stimulus can be used to measure both frequency response and distortion and lends itself to gated operation. A wavelet can be designed with a flat-top spectrum one-half octave wide using an IFFT and windowing. A lower crest factor wavelet with attractive qualities can be constructed with multiple synchronous sine waves and used in a measurement system particularly suitable for quality control testing. The synchronous wavelet has a flat spectrum over one-quarter to one-half octave, and is zero outside that region, leaving a wide dynamic range for distortion components to be detected. Comparisons with standard swept sine measurements are presented.:

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