[PD] 64 bit audio?

Alexandre Torres Porres porres at gmail.com
Fri Nov 27 17:19:48 CET 2015

2015-11-27 9:59 GMT-02:00 katja <katjavetter at gmail.com>:

> This topic keeps popping up on Pd list with stable frequency.

And I'd say I'm guilty for a few of those

> the price seemed to be acceptable at the time of writing (2011).

I'm aware of the writing for a few years now, and I was actually
wondering/asking if by now, 2015/2016 if this move ahead was being

By the way, I learned this days that Max did make this move a while ago in
Max 6 (that's about 2011, btw), which was quite surprising for me.

That was before the advent of pico computers like Raspberry Pi

Exactly, I had that in mind too, but one way or another, I was thinking of
a move to 64 bits as an extra (and supported/distributed) feature, but
still keeping the 32 for legacy reasons and the usage in pico computers.

> Also I realized only later that making _all_
> external libs double-precision-aware is mission impossible.

well, there's a curious and relevant fact, I wonder why, but I'll just
believe it.

> double precision build is mainly valuable for evaluation. It helps finding
> out how important precision is for some routine, and may even provide
> insights which help to fix some precision issue within the constraints of
> single precision Pd.

Cool, I was really curious in knowing more about all this, so I was
researching again. Specially after learning that max has been 64 bits for a
while, it seemed nice to evaluate what it has that Pd and SC don't.

Here's the only video I found about it anyway...


It just shows about reading long buffers, that's it, and we know that...

Seems like feedback loops in filters is something to note as relevant in 64
bit precision from what I was reading, and also from the answer I got in
the SC list, which they seem to deal with internally anyway.

Sorry for insisting, but then, is that really only it?

Since the long buffer issues have a workaround with the onset inlet in
[tabread4~], that's something I'd let go. And seems like 64 bit is just too
much hassle for audio processing and quality. The only issue still worth
noting seems to be the quality in filters, but, what I understand here is
that you couldn't "work that out internally" in Pd like they're saying
they're doing in SC, right?

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