One way to do stretched partials is to use pvshift. It allows you to  
add a frequency shift to partials, e.g,  part1 +  shift, partial2 +  
shift, etc,
stretching or compressing the spectrum. You can set a lowest  
frequency, above which the shift is effected.

Victor

On 26 Dec 2010, at 08:48, Stefan Thomas wrote:

> I would like to ask You a question about stretched spectra.
> Is it true, that a strectched (or  compressed) spectrum can be  
> generated  in the following manner:
> ioctave        = 39/19
> ifundamental     = icps*1
> ipartial2    = icps*ioctave
> ipartial3    = icps*ioctave^(log(2)3)
> ipartial4    = icps*ioctave^(log(2)4)
> (etc.)
> I think, it should be like that, but I'm not quite sure about this.
> Did anyone else try to do something similar?
> Thanks for You help,
> Stefan
> P.S.: Merry Christmas!



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To follow Victor's post you may want to take a look at Matt Ingalls UDO here:

http://www.csounds.com/udo/displayOpcode.php?opcode_id=10


Best,
Peiman

On 26 December 2010 09:57, Victor Lazzarini  wrote:
> One way to do stretched partials is to use pvshift. It allows you to add a
> frequency shift to partials, e.g,  part1 +  shift, partial2 + shift, etc,
> stretching or compressing the spectrum. You can set a lowest frequency,
> above which the shift is effected.
>
> Victor
>
> On 26 Dec 2010, at 08:48, Stefan Thomas wrote:
>
>> I would like to ask You a question about stretched spectra.
>> Is it true, that a strectched (or  compressed) spectrum can be generated
>>  in the following manner:
>> ioctave        = 39/19
>> ifundamental     = icps*1
>> ipartial2    = icps*ioctave
>> ipartial3    = icps*ioctave^(log(2)3)
>> ipartial4    = icps*ioctave^(log(2)4)
>> (etc.)
>> I think, it should be like that, but I'm not quite sure about this.
>> Did anyone else try to do something similar?
>> Thanks for You help,
>> Stefan
>> P.S.: Merry Christmas!
>
>
>
> Send bugs reports to the Sourceforge bug tracker
>           https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe
> csound"
>
>


Send bugs reports to the Sourceforge bug tracker
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Discussions of bugs and features can be posted here
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