Subject: Re: [linux-audio-user] Pitch shifting
From: Guenther Sohler (guenther.sohler_AT_newlogic.com)
Date: Mon Jan 28 2002 - 17:17:15 EET
Whats the exact mathematical background of good pitch shifting ?
you convert (eg 256) samples with fft, then you crunch or enlarge the frequency
scale and convert it back to samples
but
* the minimal frequency converteted depends on the number of samples
* I dont know whether the result would be good if you took too much
samples(65536)
* If you dont do a phase alignment, the result sounds very cracky (not
monotonically)
* If you do a phase alignment between the samples, the result values might go
out of the integer boundary.
so whats a good way to do pitch scaling ?
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