One solution, and I'm sure I've suggested this before, is to generate
a constant HQ tone, then use the "Sliding Time Scale / Pitch Shift"
effect to turn it into a sliding pitch tone (a "chirp").
Steve
On 13 January 2017 at 12:16, Robert Hänggi <aarjay.robert@xxxxxxxxx> wrote:
Hi Annabelle
This isn't easy to do because Steve's code builds a table (one cycle)
with the individual harmonics added.
This table could theoretically be applied to a chirp.
However, the problem is that the number of harmonics change with the
rise and fall of the frequency:
Chirp 200 to 10000
Harmonics 100 down to 1
Thus, I would take a different approach with oversampling:
- add new track
- track drop down menu (shift+m) -->rate-->other
- enter the new sample rate 1000000 (approx 23 x oversampling)
- create the chirp
- track menu-->resample 44100 (or whatever you want)
I hope this is sufficient until Steve may have another proposal.
Robert
2017-01-13 1:03 GMT+01:00, Annabelle Susan Morison <foristnights@xxxxxxxxxxx>:
Hi, it's Annabelle.
How would I make the code for a plugin that can generate chirps without
aliasing distortion? That is, a chirp generator based on the HQ Tone
Generator?
The audacity4blind web site is at
//www.freelists.org/webpage/audacity4blind
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