[PD] audio bit resolution in Pd
Alexandre Torres Porres
porres at gmail.com
Thu Apr 23 00:11:23 CEST 2015
> > It's clear to me that the resolution for audio streams sent from pd (with
> > values between -1 and 1) can't be considered as "32 bits".
> which is just wrong: Pd's audio samples are 32bit floating point.
> as such they must be considered as "32bit floating point" which is a)
> "32 bit" and b) something else as "16bit PCM" or "8bit ulaw" or what you
> call "32 bits" (which is likely "32bit fixed point").
Maybe I'm not being clear, let me try again. When we talk about "audio in
Pd" we can mean two things:
One is that audio signals in Pd can be just about any number according to
the bit resolution, which is 32-bit float. Cool. I don't remember the
limits of this, but it's just quite a lot.
Another thing is the actual audio that comes out , and the restrains are
numbers from -1 to 1! So, What goes to the soundcard is not all the
possible values that you can get with 32-bit float, and just "less" of
that, which is whatever you can get between -1 and 1 in 32-bit float.
So I start with this idea that the audio (values from -1 to 1) can't be in
full 32 bit float resolution, it's less. I don't see why that is "wrong".
And then, from it, my first question here was: "what is the audio
resolution then?". I'm still clueless here about this answer.
Moreover, is it more or less than what 24 bit audio cards handle?
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