Time-stamping and Discretising Audio Signals into Raw Data

  • #1
I'm logging the RPM of a scaled wind turbine using a laser and modified microphone (with a photocell instead of a coil).

The signal is recorded using Audacity and is a series of troughs separated by the time it takes for one blade to pass through the beam (please see attached image below).

Is there a way to convert this signal into an array of time-stamps and signal strengths (0.0 to 1.0)?

I aim to eventually have a time vs. instantaneous RPM plot.
 

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  • #2
ranger
Gold Member
1,676
1
Does Audacity support exporting your data into a csv style or similar format? What is the worst case value you might expect for RPM?

Are you able to interface to some signal conditioning circuit and then a uC? Maybe you want to leave the uC out of the picture and do some low level programming and interface your signal conditioning circuit to a port (serial/parallel) via an ADC?
 
  • #3
Thanks for your response. We're now pursuing your method.

Would you have any advice on the ADC/computer interface?
 

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