[sdiy] samplers & pitch shifting

Tim Ressel timr at circuitabbey.com
Sun May 13 18:26:28 CEST 2018


I think I saw that in the Chamberlin book. But doesn't that change the 
effective length of the sample?

How does Auto-tune do it?

--tr


On 5/13/2018 9:20 AM, Scott Gravenhorst wrote:
> Hi Tim and list,
>
> I'm no expert, but I know that if you raise the pitch of a band limited sample, you
> can still have aliasing unless some technique is used to prevent it.
>
> What I've done is to use fractional samples taken from the original wave and
> interpolate.  I've never gone beyond linear interpolation and have not found problems.
>   This goes for whether it's pitch down or pitch up (assuming that the band limit is at
> a low enough frequency cutoff to prevent alias artifacts.
>
> I can't say anything about the Bode as I've not yet studied it.
>
> Tim Ressel <timr at circuitabbey.com> wrote:
>> Hi,
>>
>> Forgive me if I've asked this before. I can't seem to get my head around
>> this. I'm told if you make for example a drum machine that uses samples
>> you HAVE to be able to change the pitch. How is this done? The pitch has
>> to change but the sample length stays the same. Are we talking about a
>> digital version of a Bode pitch shifter?
>>
>> -- 
>> --Tim Ressel
>> Circuit Abbey
>> timr at circuitabbey.com
>>
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> -- ScottG
> ________________________________________________________________________
> -- Scott Gravenhorst
> -- http://scott.joviansynth.com/
> -- When the going gets tough, the tough use the command line.
> -- Matt 21:22
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-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com



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