I want to measure the parameters of a lavalier microphone like this one:
The data I am most interested in are sensitivity, s/n ratio and frequency response.
To measure the frequency response, do I need an anechoic chamber?
What particular equipment do I need for a scientific measurement?
Thanks.
The data I am most interested in are sensitivity, s/n ratio and frequency response.
To measure the frequency response, do I need an anechoic chamber?
What particular equipment do I need for a scientific measurement?
Thanks.
https://nvlpubs.nist.gov/nistpubs/jres/092/jresv92n2p129_A1b.pdf
https://www.pcb.com/Contentstore/mktgcontent/WhitePapers/WPL_36_Acoustic_methods_calibration_PCB.pdf
What is probably within normal capabilities is to compare two microphones to each other. Using a clamp to interchange each microphone to the exact same position from the sound source.
What might be more fun and practical is to make a hot wire sound source and just use that as a reference.
https://www.pcb.com/Contentstore/mktgcontent/WhitePapers/WPL_36_Acoustic_methods_calibration_PCB.pdf
What is probably within normal capabilities is to compare two microphones to each other. Using a clamp to interchange each microphone to the exact same position from the sound source.
What might be more fun and practical is to make a hot wire sound source and just use that as a reference.
At higher frequencies a pulsed signal can eliminate room reflections in order to measure response, at lower frequencies you can compare to a reference microphone close by meaningfully, so in theory you may be able to avoid an anechoic chamber. And of course the noise source needs to be calibrated somehow.
Sensitivity is just the response at one frequency, and noise you may need an extremely quiet environment (padded box) to eliminate acoustic interference with a sensitive microphone, and of course a low noise mic preamp to measure it (with whatever bandwidth limiting and shaping you need for the particular noise specification).
Sensitivity is just the response at one frequency, and noise you may need an extremely quiet environment (padded box) to eliminate acoustic interference with a sensitive microphone, and of course a low noise mic preamp to measure it (with whatever bandwidth limiting and shaping you need for the particular noise specification).