Rub and Buzz Measurement (DAQmx)

Publish Date: May 11, 2008 | 1 Ratings | 5.00 out of 5 | Print | Submit your review


Two VIs are included with this document:
  • Rub and Buzz Measurement Example (DAQmx)
  • Rub and Buzz Analysis VI
Add this rub and buzz measurement VI into your application to calculate the rub and buzz percentage of your audio system components.  The VI utilizes THD and harmonic analysis data from the THD VI in the NI Sound and Vibration Measurement Suite and NI Sound and Vibration Toolkit.  Users can configure the minimum and maximum harmonic to calculate rub and buzz percentage from.

This Virtual Instrument is designed to work with data acquisition hardware from National Instruments. To find compatible hardware for this application, visit

This software is written in LabVIEW, a graphical programming language designed for scientists and engineers. For more information about LabVIEW, visit

Sound and Vibration Developers Library
The NI Sound and Vibration Developers Library is your one-stop online resource for learning about and downloading code for acoustic analysis, machine diagnostics and audio test functions. On this page, you will find links to detailed tutorials, application notes, example programs, and analysis function descriptions.

More information on National Instruments signal processing can be found at the Signal Processing Resource Center.

Table of Contents

  1. About Rub and Buzz Measurements
  2. Front Panel Screens
  3. Related Links

1. About Rub and Buzz Measurements

Rattle noise or rub and buzz are part of a class of non-linear, irregular, impulsive and unwanted distortion effects, which are not normally found with regular units under test (UUTs), rather they are typically produced by mechanical and structural defects in the UUT.  Due to short pulses of very low energy traditional testing and analysis methods like RMS-FFT and Total Harmonic Distortion (THD) are not useful.  More information included a detailed case study is available in the Rub & Buzz and High Order Harmonic Analysis Tutorial.

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2. Front Panel Screens

These are pictures of the VI's front panel tabbed content. To view the block diagram and additional documentation, download the attached file.

This example requires LabVIEW and the Sound and Vibration Measurement Suite.  If you do not have access to these, you can always try them out online at the LabVIEW Online Evaluation.

Rub and Buzz Analysis Function VI

Rub and Buzz DAQmx Example VI

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3. Related Links


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Rub and Buzz Analysis Function


Rub and Buzz (DAQmx)



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