[music-dsp] testing different subject header

robert bristow-johnson rbj at audioimagination.com
Mon Apr 9 18:20:24 EDT 2012


testing 1,2,3...

this is identical to a previous message (that would not get past my 
SMTP) with this sentence added and the subject header changed..

On 4/9/12 5:25 PM, Julian Schmidt wrote:
> Am 09.04.2012 23:22, schrieb Olli Niemitalo:
>> On Mon, Apr 9, 2012 at 11:32 PM, Julian Schmidt
>> <julian_schmidt at chipmusik.de>  wrote:
>>> I really think it is an aliasing problem.
>>> but not due to the wrong wavetable content, but due to a cheap audio 
>>> codec
>>> with poor filters.
>>> [...]
>>> even when i output a single 440hz sine i get harmonics starting at 
>>> -48db up
>>> to nyquist and beyond.
>> Lemme guess your wavetable size is 256? That's the amount of
>> distortion that would be expected from using "no interpolation". If
>> that's what you have then the codec is not at fault.
>
> i use code similar to what RBJ has posted with linear interpolation 
> (although with a tablesize of 256 at the moment).
>
> julian
>>
>> -olli
>> -- 
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>> reviews, dsp links
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>
> -- 
> dupswapdrop -- the music-dsp mailing list and website:
> subscription info, FAQ, source code archive, list archive, book 
> reviews, dsp links
> http://music.columbia.edu/cmc/music-dsp
> http://music.columbia.edu/mailman/listinfo/music-dsp
>
>


-- 

r b-j                  rbj at audioimagination.com

"Imagination is more important than knowledge."





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