Hello,
In trying to find the waveform of lightsaber noise, I tried out:
Play[2*Pi*f*t]
I was wondering why this behaves weird as f becomes too high.
I know that I shouldn’t be able to hear above 20,000 Hz, yet the computer still plays sound fine after this point. Further, at 60,000 Hz and above, the function starts making really pretty chime/bell noises. What is going on? Why is it behaving like this?
Probably due to Aliasing you hear strange stuff for high frequencies. Check the sampling frequency. (SampleRate).
Yes, that would be aliasing. Default sample rate for Play is 8000 Hz, I believe. You can set another one with option SampleRate->44100, e.g.
As a side note, totally irrelevant to you question but some fun, here is a way to generate a very simple bell sound.
Module[{f = 650., op, env},
env = Interpolation[{{0, 0.}, {0.01, 1}, {0.05, 0.3}, {0.4,
0.1}, {1.5, 0.01}, {1.8, 0}, {2, 0}}, InterpolationOrder -> 1];
op[f1_, f2_, gain2_] = env[t] Sin[2. Pi f1 t + gain2 Sin[2. Pi f2 t]];
Play[{
op[f, 3.5 f, 2.],
op[f + 5., (3.5 + 0.1) f, 2.3]
}, {t, 0, 2}, SampleRate -> 22050.]]
