[linux-audio-dev] Re: idea: wavelets, sampler program

Tom Weber np98towe at dd.chalmers.se
Fri Jun 20 13:42:01 UTC 2003

> There may be some problems...
> - What about noise-like signals ? 

The brain treats all sound in a fourier representation, noise also.
Don't you think noise sounds like thousands of different beeps? The
computer representation would be no different.

> - For a resolution of 0.1 Hz you need 10 seconds of sound. Only a
>   sine wave lasting the whole 10 s will tranform as a 'peak',
>   else will be smeared out.  

Hmm, are you sure? I would agree on that for a 0.1 Hz signal, which is
not the case. Assume the sound contains a 100.0 Hz signal, then the
analyzed amplitude (using sin and cos for phase independency) should
be higher for 100.0 Hz than for 99.9 or 100.1, even for short periods.
But I'm a newbie to DSP...

What I actually aim at doing is a "sampler" program/plugin with pitch
scaling, using this "complete fourier transform" approach to overcome
the problems listed in:
Any suggestions?

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