Audacity Forum

Record some of your speech. Can you instruct Audacity to separate vowels and consonants? So far it's just my own exercise in understanding snd-fft, but it might evolve into something useful for my work with spoken word. Several knobs to play with, I hope the dialog is self explanatory. The default s...

I am using version 2.0.3 on windows 7 and I am sure that when I make a single bright band in the view with rectangular window, it is from about 170 to 340 Hz on the scale.

Perhaps we have identified a minor difference of display behavior across platforms!

Yes, but I mean that the spectrogram display puts those frequencies at the bottoms of the corresponding colored bands, not the middle. That's just presentation of course. But do you mean that a better display would center the bands on those frequencies? That frequencies close to but not quite equal ...

steve wrote:

Paul L wrote:Generate a sine wave at 172.265625 Hz. That makes the period equal to 256 samples at 44.1kHz sampling

So that is a special case where the signal lies dead centre of one of the frequency bands.

Center, or bottom? 173 Hz seems to correspond to the bottom of the band on the vertical scale.

I do find spectrogram useful with the defaults. I can often zoom right in on a crackle inside recorded speech, which would be hard to hunt for in waveform view, but I use waveform dB view for a precise selection. The trick of synched tracks with identical contents, one of them mute, is useful. Anywa...

Not sure which is the right board to ask this mathematical question on... anyway: Where can I learn about the window type options for the Spectrogram preferences? Generate a sine wave at 172.265625 Hz. That makes the period equal to 256 samples at 44.1kHz sampling, and so equal to the default window...

Are you suggesting my humble efforts will find their way into releases too? I'm flattered. Or I suppose I should be bold and write them as if they might be. :twisted: I understand your good critical intentions, but I think some things in programming are a matter of taste... I always learned that glo...

I was rethinking and editing my last post, I think our messages crossed.

But I suppose I could use snd-from-array and snd-fetch-array to convert? Would this change a frame to the array of squares, faster than loops written in lisp? It is less code to read. (let* ((snd (snd-from-array 0.0 1.0 frame)) (sndsq (mult snd snd)) (len (length frame))) (snd-fetch-array sndsq len ...

I just looked up the distinction between sref-inverse and snd-inverse. Might the use of snd-inverse be an improvement in time complexity here?