Hi, I’m completely new to Nyquist and fairly inexperienced with Audacity so please pardon if this question is too basic. I’m trying to demonstrate aliasing to my students and I thought Audacity would be an ideal platform for the students to play around with this and many other aspects of signals and systems. I can do that somewhat using the bandlimited resampling under the Tracks menu if I switch off High Quality Sinc interpolation. I’d like to do a naive resampling with linear interpolation using force-srate.
So here is an example of what I get, although this particular example would not show aliasing:
I generate a 400 Hz sine wave for 30 sec sampled at 44100 Hz.
I select all of the signal.
I pull up a Nyquist prompt and enter (force-srate 22050 s).
Nyquist then spits out a signal that is only 15 sec duration.
I had expected the duration would remain the same and the signal would only have half the number of points.
TIA for any suggestions that set me straight on this.
ETA: OK I found the answer here. Nyquist and Audacity do not share the sampling rate parameter. https://forum.audacityteam.org/t/track-sampling-rate-question/9347/1
Thanks much to steve.
Live and Learn. Should be a very good demo for the students to play around with.