Audacity Forum

Steve, Thank you! That is enormously helpful! Though the math is easily accessible, the Nyquist language is rather opaque. The final step you describe is a conversion to decibels. Does that mean that this whole time, we've been analyzing the loudness of our recordings not just in RMS, but in decibel...

So what I'm looking for specifically is audible sound over time: time on the x-axis, loudness on the y. Any measurement of "loudness" requires that the frequency bandwith (range of frequencies) is defined, however for the sake of a math project I doubt that your teacher will really be expecting any...

Hello All, We've gathered our data and, with some effort, have managed to analyze some of it in Audacity. We've had trouble analyzing large files (anything significantly over 150 minutes), and so have done our best to select representative portions of our day-long recordings. We've then taken the ro...

Our project is not a physics project, but a math project. We are, therefore, not concerned with any particular sort of loudness, but interested in seeing relative changes over time so as to model them mathematically. We're measuring the sound inside classrooms, which we expect to model sinusoidally,...

That sounds like a good plan. In terms of the actual process, how would I do the loudness measurement in Audacity? I need numerical data, not just the simple amplitude graph.

You're looking for a Sound Pressure Level meter. You can force Audacity to approximate one of those, but you will never get "real" dBSPL numbers. Just relative ones. This sound is 3dB louder than that one. How loud are they? No idea. This is a newer version of the ones we use and there isn't a lot ...

Hello All, Would it be possible to use Audacity in conjunction with a computer microphone to monitor Db levels over long periods of time? For a school project I need to model the change in sound levels in various different locations, and need an accurate (and preferably affordable) way of making acc...