Most of the traditional techniques transform the distorted time signal into the frequency domain to measure harmonic and intermodulation as additional spectral components. The amplitude shows the mean energy of the distortion averaged over the analyzing interval usually the period of the fundamental tone. A novel identification technique is presented to measure the instantaneous distortion (ID) versus time, frequency, displacement or other state variables. The ID shows the full fine structure of the distortion and their dependency on the cause of the distortion. Statistical analysis applied to the ID lead to the peak value (PHD) and crest factor (CHD) which seems to be important characteristics comparable with the total harmonic distortion (THD). The practical application, the interpretation of the results and diagnostics of speaker defects caused by design or manufacturing are discussed in the paper.
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