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喇叭互调失真研究
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Intermodulation Distortion
A nonlinear system generates new spectral components which are not in the stimulus. In addition to harmonics, the fundamental components interact with each other and generate difference-tone and summed-tone components in the output signal (see figure below). In the time domain the intermodulation causes a variation of the phase (instantaneous frequency) or an amplitude modulation of the envelope. Loudspeakers and other electro-acoustical transducers generate significant intermodulation distortions in the audio band which have a significant impact on the perceived sound quality. The inductance nonlinearity L(x) produces low harmonic distortions at low frequencies but generates wide-band intermodulation which rise to significant values (30 %) at higher frequencies. Intermodulation distortion can easily be detected by using a two-tone signal with varying frequencies of the excitation tones (“bass tone sweep” or “voice tone sweep”).
KLIPPEL RnD系统测试解决方案
SIM 2 module predicts the intermodulation distortion using a large signal model and the measured linear and nonlinear lumped parameters of the loudspeaker. The results are presented in a similar format like the DIS module.
module provides a two-tone stimulus to perform intermodulation measurements according to common international standards. DIS also separates amplitude modulation distortion and reveals the variation of the envelope.
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