Time-stamping and Discretising Audio Signals into Raw Data

AI Thread Summary
The discussion focuses on logging the RPM of a wind turbine using a laser and a modified microphone setup. The user seeks to convert recorded audio signals into an array of time-stamps and signal strengths for analysis. They inquire about Audacity's capability to export data in a CSV format and ask for worst-case RPM values. Additionally, there is interest in interfacing a signal conditioning circuit with a microcontroller or using low-level programming for direct data acquisition. The conversation emphasizes the need for effective ADC and computer interface solutions.
scottyheist
Messages
3
Reaction score
0
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.
 

Attachments

  • PF.jpg
    PF.jpg
    6.8 KB · Views: 522
Engineering news on Phys.org
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?
 
Thanks for your response. We're now pursuing your method.

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

Thread '3-terminal device external modeling'

Very basic question. Consider a 3-terminal device with terminals say A,B,C. Kirchhoff Current Law (KCL) and Kirchhoff Voltage Law (KVL) establish two relationships between the 3 currents entering the terminals and the 3 terminal's voltage pairs respectively. So we have 2 equations in 6 unknowns. To proceed further we need two more (independent) equations in order to solve the circuit the 3-terminal device is connected to (basically one treats such a device as an unbalanced two-port...
View full post »
Thread 'Weird near-field phenomenon I get in my EM simulation'

Thread 'Weird near-field phenomenon I get in my EM simulation'

I recently made a basic simulation of wire antennas and I am not sure if the near field in my simulation is modeled correctly. One of the things that worry me is the fact that sometimes I see in my simulation "movements" in the near field that seems to be faster than the speed of wave propagation I defined (the speed of light in the simulation). Specifically I see "nodes" of low amplitude in the E field that are quickly "emitted" from the antenna and then slow down as they approach the far...
View full post »

Similar threads

Op-amp compensation of cascade fudges audio signal oddly
Replies
3
Views
2K
Modern Digital Audio: Understanding Dither and Oversampling in Hi-Res Age
Replies
17
Views
4K
How Can I Transmit Stereo Audio Signals Using a Laser?
Replies
23
Views
10K
How Does ANSYS v12 Enhance Rotordynamic Analysis?
Replies
23
Views
37K

Hot Threads

Recent Insights

Back
Top