Talk:Audio timescale-pitch modification

From Wikipedia, the free encyclopedia

[edit] naming

I propose the article be named Audio timescale/pitch modification or something similar, since it is not always stretching, not always a constant scaling, not always timescale, etc. it is longer, but more accurate. I hope to add more detailed information to the article soon, but for now, does anyone have an opinion on a different name? Omegatron

Ok, I moved it to Audio timescale-pitch modification. Originally I used a slash but then i realized it looked like a subpage in the address bar. Let me know if i was a bad wikipedian. Omegatron

I agree that timestretching without changing pitch, or pitch shift without changing the time duration, both use the same algorithms.
But since we *percieve* time duration as something independent of pitch, that is the entire point of trying to adjust one without adjusting the other.
Perhaps it would be better to have 2 pages ( timestretching and pitch shift ), one on the applications of time stretching, the other one on the applications of pitch shifting, since they *seem* to be 2 different things.
(But we only need a detailed description of the algorithms on one page).
--68.0.120.35 23:03, 28 January 2007 (UTC)

[edit] introduction rewritten

This introduction was copied from Damian Yerrick's E2 writeup. It will need to be rewritten from an encyclopedic neutral point of view.

OK, I have a song stored as 2-channel, 16-bit linear PCM on my reasonably fast computer. I want to slow down the tempo because I'm trying to remix with another song. "Re-perform it!" No, I don't have the source score or samples, and I don't have the vocal training; all I have is this wav file I extracted from a CD. "Resample it!" No, resampling digital audio has an effect analogous to that of slowing down a phonograph turntable: it transposes the song to a lower key and makes the singer sound like an ogre.


I took it out of the article. I covered why you would need this processing and why resampling doesn't cut it. Any other concepts from this intro you think should be in the article, add them. Omegatron

Hi, i you describe time-domain pitchshifting as 'time domain harmonic scaling' and 'synchronized overlap-add method'. I think it's safe to call it 'granular' (described in granular synthesis), however the term is mostly used for digital systems and there is an analog implementation. It's a tape delay with multiple heads on a rotating device (source "Electronic Music" by Alan Strange). Hope i could help a bit. Bladi

[edit] No mention of AKAI? who wrote this artical?

whoever wrote this artical on timestretching without mentioning the S950, S1000, S2000 needs to think if they deserve life on earth! —Preceding unsigned comment added by 86.144.225.53 (talk) 00:35, 13 April 2008 (UTC)