Subject: Re: [linux-audio-dev] How hard is it to write a pitch shifter?
From: Cournapeau David (cournape_AT_enst.fr)
Date: Wed Apr 07 2004 - 11:46:44 EEST
Erik de Castro Lopo wrote:
>>But I cant find out how to deal with the missing data that is removed - to
>>keep the original length.
>>
>>
>
>Changing the pitch without changing the length is true pitch shifting. The
>code and concepts required to do this well is extremely complicated.
>
>
To do it well is difficult, but the basic stuff is really simple, if you
have a library to do sample-rate conversion: doing the time scale
compression/expansion
with the simplest method (overlapp add) is just a matter of buffering.
It will sound awful, of course !
David
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