View Single Post
Old 08-05-2019, 06:50 AM   #504
Schöpke
Human being with feelings
 
Join Date: Jan 2013
Posts: 39
Default De-Doppler an audio signal by function?

Timestretching usually is constant. Few programs offer bézier handles and such to control the lead-in and lead-out. But that's all. I need better.

So the audio I have was in fact recorded in nonlinearly timestretched form, because the sound source was moving toward the microphone -- geometry, speed, and distances are all known at this point. Basically I want to "de-Doppler" the signal!

The means to take out the Doppler effect is sqrt(1+x^2), x being the ratio of linear to offset distance (by courtesy of geraintluff).

I would now like to apply that function to control the amount of stretching (NOT the stretching algorithm itself!) of the signal at any given point. That function would then serve as kind of an automation curve, only that its done algorithmically instead of by "Touch". This "stretch factor(t)" could be derived from the ratio "actual moment/total length".

Is this at all possible?

Dieter

Last edited by Schöpke; 08-05-2019 at 07:13 AM.
Schöpke is offline   Reply With Quote