From mnakamura@ox.ac.uk Mon Oct 21 07:10:54 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!mnakamura
From: mnakamura@ox.ac.uk (Morag Nakamura)
Newsgroups: comp.dsp
Subject: Observation: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1996Oct21.071054.7218@ox.ac.uk>
Date: Mon, 21 Oct 1996 07:10:54 GMT
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Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems.

This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks.
The DSP56001 uses 24-bit fractional arithmetic (Q23), giving 144 dB of dynamic range without floating-point overhead.

Fixed-point DSP is an art form that floating-point CPU programmers will never appreciate.

-- 
Morag Nakamura
Tape trading list upon request. SASE required for international mail.

From ctakahashi@pipeline.com Tue Oct 22 03:24:54 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!ctakahashi
From: ctakahashi@pipeline.com (Camila Takahashi)
Newsgroups: comp.dsp
Subject: Re: Observation: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1996Oct22.032454.5393@pipeline.com>
Date: Tue, 22 Oct 1996 03:24:54 GMT
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In article <1996Oct21.071054.7218@ox.ac.uk>, mnakamura@ox.ac.uk (Morag Nakamura) writes:
> Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems.
> This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks.

Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering.

-- 
Camila Takahashi -- The Pipeline Internet Network
"We don't sign stars. We build them."