Could somebody point me to a voice alteration algorithm? Preferably in Java or C? Something that I could use to change a stream of recorded vocals into something that sounds like Optimus Prime. (FYI- Optimus Prime is the lead Autobot from transformers with a very distinctive sounding voice... not everybody may know this.) Is there an open source solution?
+1
A:
Audacity is an open-source wave editor which includes effect filters - since it's open source you could see what algorithms they use.
Matt Howells
2009-07-21 12:59:47
A:
Yes, I'm familiar with Audacity and I'm actually looking into some of it's filters. I was hoping someone could point me to a general algorithm I could use to alter recorded voice.
Cliff
2009-07-26 01:14:48
+1
A:
Not knowing what it sounded like, I figured it would be a vocoder, but after listening to a few samples, it's definitely not a vocoder (or if it is, it's pretty low in the mix.) It sounds like maybe there's a short, fast delay effect on it, along with some heavy EQ to make it sound kind of like a tiny AM radio, and maybe a little ring modulator. I think that a LOT of the voice actor's voice is coming through relatively intact, so a big part of the sound is just getting your own voice to sound right, and no effects will do that part for you.
All the above info is just me guessing based on having messed around with a lot of guitar pedals over the years, and done some amateur recording and sound-effects making, so I could be way off.
smcameron
2009-07-26 02:13:18
That makes sense. He could use a high-pass filter instead of EQ maybe. A good oversampling digital ring modulator would be nice. That's what they used for the Daleks in Doctor Who.
Nosredna
2009-07-26 23:22:00
A:
I'm looking for something like an API that performs transformation effects to an audio stream like MorphVox. I'm going to experiment with changing the sample rates to see how that works. I theory that should allow me to change the pitch, however I'd like either some examples or an API if someone has done this before.
Cliff
2009-07-26 23:15:27
+1
A:
You can't just change the sample rate. The human voice has formants. What you want to do is move the formants. That should be your line of research.
Read about vocoders and filter banks.
Could you provide a link as example? I haven't seen the film so I'm just speculating.
Nosredna
2009-07-26 23:19:13