measuring noise levels via a contour recording
I have a Contour GPS, mounted to my motorbike helmet.
My aim is to compare wind noise with different windscreens fitted to my bike.
So I thought I could record a video, and then use software to see how loud the recording is.
Then the question is how to compare the noise levels in the different videos.
Relative is easy; I can just use one of the noise levels apps on my phone. Or maybe there is some movie playback software that gives an indication.
Does anyone have any idea how to get absolute decibel levels? I guess I could take the phone decibel level app with me to get an idea. Or calibrate using some stationary motor (eg tractor or chainsaw). But maybe there's a smarter way?
thanks .. Jason
Given that the mic and position are relatively constant there is a good basis for using comparitive analysis.
There are a couple of acoustic FFT software downloads around that you could use while using playback on your pc through stock standard speakers and mic with the acoustic software. alternatively you could run a file convert from current format to WAV which some software packages use.
As a Reliability Engineer I have used high end professional systems like Bruel & Kjaer. given you have not gone down a sound pressure path or a Db comparison, this won't be necessary.
You just need something to clearly find frequency and amplitude changes and then determine if the overall is less.
This will be qualitative and subjective but actually completely fit for your purpose.
Google hotword search; FFT acoustic spectral free software
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