From: Henryk =?ISO-8859-15?Q?Pl=F6tz?= <henryk@ploetzli.ch>
To: bluez-devel@lists.sourceforge.net
Subject: Re: [Bluez-devel] more encoder stuff
Message-Id: <20041126000655.1a762210.henryk@ploetzli.ch>
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Date: Fri, 26 Nov 2004 00:06:55 +0100

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Moin,

Am Thu, 25 Nov 2004 07:51:24 +0100 schrieb Marcel Holtmann:

> The MAD library (www.underbit.com/products/mad/) is using fixed-point
> integer computation. Do you think it is possible to do the same thing
> for SBC? Will it give us some extra performance?

Unfortunately I'm not familiar with fixed-point arithmetics, especially
with how to handle multiplication. So if anyone who has done this before
would step forward ...

Well, I did some naive tests: I probably did something wrong, but I'm
not seeing any significant difference between floating point and fixed
point (that is: integer). For multiplication the difference is not
noticeable (1.38s vs. 1.36s in my test program) and for addition it is
not that big (0.77s vs. 0.47s).

I guess we'll be fine using floating point as long as there is an FPU.

--=20
Henryk Pl=F6tz
Gr=FC=DFe aus Berlin
~~~~~~~ Un-CDs, nein danke! http://www.heise.de/ct/cd-register/ ~~~~~~~
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