microphone's frequency response

[popcorn]

Hi,

Is it possible to plot a microphone's frequency response using sound and vibration? If it's possible, can anyone tell me how?

Thanks

[Alex A.]

This Developer Zone article should get you up and started: SignalExpress - Simple Frequency Response Measurement

[aki_t]

Hi popcorn,

If you have the Sound and Vibration Assistant with SignalExpress, there is a step you can add under Analysis - Frequency Domain Measurements called, Frequency Response.

Here's a link to an article that discusses various functions, Sound and Vibration provides.  Although the article discusses LabView, many of the same functions are found in SignalExpress as well.  The Frequency Response Function can be found at the bottom.

https://www.ni.com/en/shop/labview/vibration-analysis-and-signal-processing-in-labview.html

Aki T.

[DFGray]

Unfortunately, what neither of these articles mention is that you also need a calibrated sound source.  You can either use a source which supplies a flat output response or use one whose output response is known.  You can use a known output response to modify the measured response of the microphone to get the true response.