Frequency modulation - can you remove it?

Special Interest Groups Audio Processing
1

Is there a way to remove the frequency modulation of a sound in Audacity. I am trying to modify calls for playbacks to animals (the pitch shift worked great!).

2

What’s been modulated with what? What’s the carrier and what’s the signal?

3

The call has a fundamental frequency that varies over the call, as do most vocalizations. I am trying to change the call so that it plays at a constant frequency (pitch) throughout the call, for example, the mean pitch. I suspect this option is not in Audacity - nothing in the manual sounded very related. By removing the modulation, I can test whether the animals respond to the normal modulation of the call.

Thanks!

4

Depending on how rapid and complex the modulation is, you may be able to manually compensate for the frequency changes by using the “Sliding Time Scale / Pitch Shift” effect (but it will probably be quite fiddly) http://manual.audacityteam.org/man/Effect_Menu#Sliding_Time_Scale_.2F_Pitch_Shift…

5

Thanks - very helpful.

SS