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Meta Hearing Technology (MHT)

Optional Modules for the KLIPPEL QC Framework

Features and Benefits

Improves standard Rub & Buzz analysis
Defect detection beyond human hearing
Extends analysis bandwidth for defect symptoms
Attenuates high-order harmonic distortion
Unmask subtle defect symptoms

A typical problem in production is dealing with the effect of tolerated distortion symptoms in DUTs such as economic products. These high frequency components degrade the sensitivity of the standard Rub & Buzz detection due to masking effects. Exploiting the highly similar symptoms of consecutive DUTs in a production process, an adaptive process models the regular distortion as produced by any good unit. The active cancellation of the regular distortion reveals tiny defect symptoms clearly that are otherwise completely masked. Even if these subtle defects are not audible during production, they may become worse over time and cause expensive damage to the final product.

This example shows a loose particle producing an inaudible click which is completely masked by the regular distortion generated by accepted motor and suspension nonlinearity. These defects can be detected by MHT before getting worse, becoming audible and causing field rejects.