Re: [LAU] About Algorithms

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From: Erik de Castro Lopo <mle+la@...>

To: <linux-audio-user@...>

Subject: Re: [LAU] About Algorithms

Date: Monday, July 18, 2011 - 7:38 am

Moshe Werner wrote:

> Dale Powell to me

quoted text

>
> > 64bits is double (comes from 32bit computer architecture, so double uses
> > two words per value.)
> >
> > Single generally uses 24bit values and 8bits of exponent.
> > Double uses 53bit values with 11bits of exponent.
>
>
>
> Oh I see. So whats this Pro tools 48bit mixer talk about that goes on in the
> industry?

That 48 bit thing could hark back to Protools when it used the Motorola
56k DSP chips:

https://secure.wikimedia.org/wikipedia/en/wiki/Motorola_56000

which are fixed point DPS chips.

According to this:

https://secure.wikimedia.org/wikipedia/en/wiki/Protools

Protools uses 48 bit fixed point arithmetic (possibly doubled 24 bit
registers of the Moto 56k or possibly custom hardware).

> Why would it be better or more precise than the Ardour mixer (which i prefer

quoted text

> over Protools).

If it is 48 bit fixed point I would think that it is inferior to
Ardour which almost certain uses double floating point which has
a 53 bit significand.

Erik
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Erik de Castro Lopo
http://www.mega-nerd.com/
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Messages in current thread:

[LAU] About Algorithms, Moshe Werner, (Sat Jul 16, 11:03 pm)

Re: [LAU] About Algorithms, lorenzo cecchi, (Mon Jul 18, 10:40 am)

Re: [LAU] About Algorithms, Fons Adriaensen, (Mon Jul 18, 2:46 pm)

Re: [LAU] About Algorithms, Fons Adriaensen, (Sun Jul 17, 8:45 am)

Re: [LAU] About Algorithms, Ken Restivo, (Wed Jul 20, 3:39 am)

Re: [LAU] About Algorithms, Dale Powell, (Sun Jul 17, 11:25 am)

Re: [LAU] About Algorithms, Paul Coccoli, (Mon Jul 18, 9:55 pm)

Re: [LAU] About Algorithms, Folderol, (Mon Jul 18, 10:03 pm)

Re: [LAU] About Algorithms, Charles Henry, (Tue Jul 19, 3:52 am)

Re: [LAU] About Algorithms, Moshe Werner, (Tue Jul 19, 3:24 pm)

Re: [LAU] About Algorithms, Paul Davis, (Tue Jul 19, 2:54 am)

Re: [LAU] About Algorithms, Paul Coccoli, (Tue Jul 19, 9:47 pm)

Re: [LAU] About Algorithms, Dale Powell, (Wed Jul 20, 4:53 pm)

Re: [LAU] About Algorithms, Paul Davis, (Tue Jul 19, 9:57 pm)

Re: [LAU] About Algorithms, Moshe Werner, (Mon Jul 18, 6:40 am)

Re: [LAU] About Algorithms, Moshe Werner, (Mon Jul 18, 7:19 am)

Re: [LAU] About Algorithms, Erik de Castro Lopo, (Mon Jul 18, 7:38 am)

Re: [LAU] About Algorithms, David Adler, (Mon Jul 18, 9:53 am)

Re: [LAU] About Algorithms, Erik de Castro Lopo, (Mon Jul 18, 10:53 am)

Re: [LAU] About Algorithms, Fons Adriaensen, (Mon Jul 18, 2:56 pm)

Re: [LAU] About Algorithms, David Adler, (Mon Jul 18, 11:56 am)

Re: [LAU] About Algorithms, Erik de Castro Lopo, (Mon Jul 18, 12:11 pm)

Re: [LAU] About Algorithms, Fons Adriaensen, (Mon Jul 18, 3:01 pm)

Re: [LAU] About Algorithms, Paul Davis, (Mon Jul 18, 3:02 pm)

Re: [LAU] About Algorithms, Fons Adriaensen, (Mon Jul 18, 3:12 pm)

Re: [LAU] About Algorithms, David Adler, (Mon Jul 18, 12:14 pm)

Re: [LAU] About Algorithms, Renato, (Mon Jul 18, 10:13 am)

Re: [LAU] About Algorithms, David Adler, (Mon Jul 18, 10:43 am)

Re: [LAU] About Algorithms, Erik de Castro Lopo, (Mon Jul 18, 10:57 am)

Re: [LAU] About Algorithms, David Adler, (Mon Jul 18, 12:01 pm)

Re: [LAU] About Algorithms, Stephen Stubbs, (Sun Jul 17, 2:17 pm)

Re: [LAU] About Algorithms, Dale Powell, (Sun Jul 17, 3:25 pm)

Re: [LAU] About Algorithms, Erik de Castro Lopo, (Sun Jul 17, 8:31 am)