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Hi-2 Weighted Harmonic Distortion (Hi-2)

Optional Module for the KLIPPEL QC Framework

Features and Benefits

  • Fast measurement of Hi2 distortion (also called „BLAT“)
  • Add-on to SPL task
  • Using sine chirp
  • Standardized or user defined limits
  • Compatible to DIS-Pro
  • Integrated in SPL task
  • Conform to automotive standard
  • Sensitive distortion measurement of higher harmonics

Hi-2 distortion (also called “Blat” distortion since detected defects sound like a “blat” on bass signals) are calculated from higher order harmonic distortion. Such harmonics are weighted in a special way to emphasize defect symptoms of unacceptable speaker behavior. The cause of the distortion was determined to be a rapid increase in suspension stiffness at large cone excursion.

This distortion measure is related to Rub&Buzz symptoms, which also indicates abnormal sound. However, Hi-2 distortion are characterized by lower harmonics than typically Rub&Buzz distortion show.

The SPL Task uses sine chirps for Hi-2 distortion measurement and can therefore measure this symptom in very short time. Hi-2 distortion may also be measured by the DIS Pro module using steady state sine tones.


Specification


Test Objects

  • Hi-2 distortion was developed for automotive woofer, subwoofer
  • applicable also to other types, especially low frequency drive units

Requirements

Test Hardware 

License Dongle (USB)

Software

Accessories



Related Information

Other Modules of the R&D System

Other Modules of the QC System



Standards

Non-official standards by automotive industry

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