Graphing, Interpretation and Comparison of Results of Loudspeaker Nonlinearity Measurement

摘要

Harmonic distortion and THD do not convey sufficient information about nonlinearity in loudspeakers and horndrivers. Multitone stimulus and Gaussian noise produce more informative nonlinear response. Reaction toGaussian noise can be transformed into coherence or incoherence function. They provide information aboutnonlinearity in the form of ” easy-to-grasp? frequency-dependent curves. Alternatively, the results of multitonemeasurement are difficult to interpret, compare, and overlay. New method of depicting the results of multitonemeasurements has been developed. The distortion products are averaged in a moving frequency window. Theresult of measurement is a single continuous frequency-dependent curve that takes into account the level ofdistortion products and their ” density?. The curves can be easily overlaid and compared. Future development of anew method may lead to correlation between the level of distortion curves and the audibility of nonlineardistortion.