[LAU] Easy sound morphing?

Renato Fabbri renato.fabbri at gmail.com
Tue Mar 31 16:32:52 EDT 2009


In [1]: import pywt as W

In [2]: W.__version__
Out[2]: '0.1.7'

(svn version afaiRemember)

2009/3/31 Renato Fabbri <renato.fabbri at gmail.com>

> Shane: that script was done using pywt version 0.1.6 (alpha) i think that
> its current. what version did you find?
> Dan: wavelets are used to represent/compress or synth signals with
> transients. kind of opposed to FFT to stationary signals... i dindt use LPC
> but i plan on studying it, do you know any good material?
> 2009/3/31 Dan S <danstowell+lxau at gmail.com <danstowell%2Blxau at gmail.com>>
> 2009/3/30, shane richards <shanerich at email.com>:
>> > I've been trying to do some sound morphs between two different hits of a
>> snare drum, one rimshot and the other a plain hit.
>> >  I tried using SMSTools, and even some windows programs under wine, but
>> the results always seem to sound more like hitting a bucket full of water
>> than a combination of the two drums.
>> Drum sounds are very "difficult" for these tools because the FFT-based
>> analysis assumes a quasi-stationary signal (imagine a sine wave that
>> never changes, that's the easiest) whereas drum hits really strongly
>> violate this. Also phase issues and other stuff. To be honest you'll
>> probably do best using some kind of clever perceptually-tweaked
>> crossfade-based technique... or maybe find something using LPC-based
>> analysis rather than FFT, that might do well (I haven't looked) - LPC
>> should have a better chance at handling drum sounds gracefully.
>> Dan
>> --
>> http://www.mcld.co.uk
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