Distortion-overtone generator wanted

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Pano

Pano

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#1
Hey guys - does anyone know of simple software that will produce harmonics (overtones) and is adjustable? I have searched and searched. I swear I had this years ago, but can't find it now.

Here is what I would like ideally:

A signal generator that will allow me to set the fundamental, say 440Hz, and then add the harmonics as I choose. Being able to vary the amplitude of each harmonic is what I want.

Anyone seen this? I can't find it. :whazzat:
 
#2
It would be a nice service to the community if someone wrote a DOS program that scanned a simple text description and wrote a .wav file. I assume this is possible, I was able to trivially write generic wav's in Linux (this was a long time ago).

Sort of mywav > makewaves > mywav.wav

mywav could be a simple text description like; length, sampling rate, bit depth, F1(mag,phase), F2(mag,phase), ...... end.

I write test vectors for Audition on a Unix box all the time. The 24 bit format is a bit convoluted but once figured out no problem.
 
#4
panomaniac said:
Here is what I would like ideally:

A signal generator that will allow me to set the fundamental, say 440Hz, and then add the harmonics as I choose. Being able to vary the amplitude of each harmonic is what I want.
Click to expand...

Some audio editors have a built-in function that can do that; Goldwave among others. As far as I know, they offer a trial period, so you can check it out. It allows you to generate audio wave forms in wav or mp3. You choose a sinewave as fundamental and than add harmonics as you like. You can then play it from the PC or record it on a CD. Of course you can generate lots of other waveforms for testing, etc.; the possibilities are almost limitless. However, you can't vary the amplitude on the go, but you may generate a set of waveforms with different amplitudes of the harmonics.

Kurt
 
#5
Thanks guys, good suggestions, all. I'm looking into additive synthesis programs, as they seem to do just what I need. That must have been what I had years ago.

I'll also look at Goldwave, as I already have that, but had not seen the multi-waveform thing in it! 😱

There was also a DIY forum member who had some distortion and othe software. He is French, IIRC. Can not find it.
 
#6
A second vote for SoX... although the user-inferface is, let's say, not very point&click.

BTW, @Scott: I usually have a DOS box opened running the good ol' BorlandC++ IDE and just program what I need from scratch (or change filenames/constants/variables) based on an old quick and dirty skeleton that can read/write WAV headers. That's a lot easier than integrating a parser into the proggy 🙂

- Klaus
 
#10
EUVL said:
I use a much simpler solution which is to generate a WAV file of the desired waveform using Mathlab.

You will find a lot of hits when you google "Mathlab WAV Generate".


Patrick
Click to expand...

You mean Matlab? I would have mentioned Mathcad and Matlab but they are not free. I also have had trouble with Mathcad and 24bit files.
 
#12
I've used SciLab, a free MathCad workalike, but it can be slow with 24 bit files and you have to add the extended wav read/write toolbox

LtSpice can output .wav from a sim, I've actually used it to generate frequency stepped test.wav files, then used Audacity to play&capture, and finally analyzed in SciLab for a completely free sw toolchain

it was much faster to use 32 bit files as SciLab is much more efficient importing these than 24 bit
 
#13
jcx said:
I've used SciLab, a free MathCad workalike, but it can be slow with 24 bit files and you have to add the extended wav read/write toolbox
Click to expand...

I'll check out SciLab. It reminds me of playing with PerlDL 10 or so years ago. I think I still have a hopelessly minute credit somewhere in the Perl archives for a fix on an arbitrary N, multi-dimentional FFT library.
 
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