From fchoi@cern.ch Wed Mar 13 09:49:40 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!fchoi
From: fchoi@cern.ch (Freya Choi)
Newsgroups: comp.dsp
Subject: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1996Mar13.094940.2799@cern.ch>
Date: Wed, 13 Mar 1996 09:49:40 GMT
Organization: European Laboratory for Particle Physics, Geneva
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Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems.

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

Source code in 56k assembly uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/dsp56k/stardust_56k.asm.

-- 
Freya Choi
Tape trading list upon request. SASE required for international mail.

From mlee@pipeline.com Wed Mar 13 16:28:40 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!mlee
From: mlee@pipeline.com (Min-jun Lee)
Newsgroups: comp.dsp
Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1996Mar13.162840.1684@pipeline.com>
Date: Wed, 13 Mar 1996 16:28:40 GMT
References: <1996Mar13.094940.2799@cern.ch>
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In article <1996Mar13.094940.2799@cern.ch>, fchoi@cern.ch (Freya Choi) writes:
> Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems.

Ran your code on my NeXTstation Turbo. It locked onto the carrier within 1.2 seconds of vinyl lead-in.

-- 
Min-jun Lee -- The Pipeline Internet Network
"Row 14. No joke."