[PD] Re: [PD-announce] PWM in Pd

[Hans-Christoph Steiner]

Even better would be to have a library of very handy objects like  
these written in Pd.  Then you wouldn't have to spend years learning  
digital audio to write your own.  Instead you could use ones that  
have been finely tuned and debugged.  And if you were interested, you  
could open them up and see how its done.

.hc

On May 26, 2006, at 4:27 PM, geiger wrote:

>
> Hi,
>
> nothing to do with PWM, but attached is a  bandlimited square and saw
> implementation, based on the BF algorithm used in the BLOP plugins,
> written in Pd only. The Pd documentation also has suggestions using  
> a BLEP
> (band limited step function).
>
> The good thing about Pd is that you do not have to look for plugins  
> that
> do the work, you can build them yourself using Pd's basic building  
> blocks.
> I also have a BLIT (band limited impulse train) implementation of the
> square wave lying around, and an implementation using integrated
> wavetables. You can even do oversampling within Pd, so nothing really
> keeps you from having bandlimited oscillators .. except that it  
> takes time
> an knowledge to build them.
>
> Günter
>
> PS: the oscs need a great amount of tweaking and/or more tables.  
> something
> to be done for the next version, but the idea should be clear.
>
>
> On Thu, 25 May 2006 derek at x-i.net wrote:
>> Hi HC,
>>
>> Hans-Christoph Steiner wrote:
>>
>>> I should say, I forgot that PWM was used in synthesis some, so I was
>>> thinking about electronics and control when I was talking about PWM.
>>> That's why my PWM objects are tailored towards, but should work  
>>> fine in
>>> the audio context too, unless you need the wandering DC offset.
>>
>> But this is still not bandwidth-limited, is it? So it's use for audio
>> would also be limited to situations where either you would use the  
>> PWM for
>> controlling a "proper" audio oscillator, or where you don't really  
>> give a
>> scheiss about aliased frequencies and audio birdies.
>>
>> I haven't checked your [square~] yet, but if it is antialiased it  
>> would
>> fill a big missing void in PD's audio arsenal.
>>
>> Otherwise, I still suggest to use the BLOP plugins for LADSPA with
>> [plugin~], which sound about as real as you can get, but still  
>> only seems
>> to work under Linux.
>>
>> best,
>> d.
>>
>> --
>> derek holzer ::: http://www.umatic.nl
>> ---Oblique Strategy # 177:
>> "What is the reality of the situation?"
>>
>>
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