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Graphing, Interpretation, and Comparison of the Results of Loudspeaker Nonlinearity Measurement

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

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