In Reply to: RE: Yup, I meant the Alvin effect posted by Todd Krieger on September 13, 2015 at 00:09:46:
Yes, if the singer sings sharp there will be more sound waves to fit in the spaces in their body. However, if the recording is speeded up then the original number of sound waves will fit in a shrunken body (resonance wise). Plus, of course, the tempo will change and the associated timing. These are all changes that happen with a different turntable speed or a slightly different sampling rate. If one does a small sample rate conversion one can get similar changes with a digital recording. (Here the sample rate is actually changed, but then the new file header lists the original sample rate. This is no different than remastering an LP at 45 RPM and leaving the label saying 33.3.)
There are digital techniques that change the pitch without changing the timing or tempo. Similarly, there are digital techniques that change the timing and tempo without changing the pitch. They work "magically" by deleting cycles from the sound waves. The reality is that they don't really work that well, because they generate artifacts which will be more or less obvious depending on the quality of the software (and amount of processing available) and the amount of change required. In extreme cases these can be applied to individual notes or portions of individual notes and then the problems become musical as well as sonic (as in Autotune).
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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Follow Ups
- RE: Yup, I meant the Alvin effect - Tony Lauck 09/14/1509:41:54 09/14/15 (0)