[PD] band limited (anti-alias) techniques

[cyrille henry]

Le 24/11/2015 16:01, Alexandre Torres Porres a écrit :
> Cool, I assumed there'd be many techniques out there.
>
> Do any of you know the advantages and disadvantages between "/oversampling + filtering/" and the other techniques?
adventage :
-easy to implement
-any waveform can be bandlimited (including sample).

disadvantage :
-can be very slow.
for a classic saw by example, there is an infinity of harmonic, of amplitude decreasing by 6dB/Octave.
if you have a perfect filter and wish 60dB S/N ration (that is not a lot), you need 10 octave between the oscillator frequency and (oversample samplerate)/2.
i.e : oversample by 512, for a 10Khz saw at SR 44100Hz.

cheers
c

>
> cheers
>
> 2015-11-24 12:53 GMT-02:00 Alexandre Torres Porres <porres at gmail.com <mailto:porres at gmail.com>>:
>
>     >there are nice saw~ and square~ in nusmuk-audio.
>
>     can't find it, is it on extended?
>
>     2015-11-24 6:20 GMT-02:00 cyrille henry <ch at chnry.net <mailto:ch at chnry.net>>:
>
>         there are nice saw~ and square~ in nusmuk-audio.
>         cheers
>         c
>
>
>         Le 24/11/2015 02:30, Alexandre Torres Porres a écrit :
>
>             hi, I know about the oversampling + filtering technique, which you can patch it, but what are other techniques for creating band limited signals you people know (not only those you could do it as a pd patch)? Yes, I'm thinking about oscillators mostly.
>
>             thanks
>
>
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