From ksokolov@pipeline.com Sat Sep 10 02:59:13 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!ksokolov
From: ksokolov@pipeline.com (Kenji Sokolov)
Newsgroups: comp.dsp
Subject: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1994Sep10.025913.9255@pipeline.com>
Date: Sat, 10 Sep 1994 02:59:13 GMT
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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.
By implementing saturated arithmetic and scaling the filter coefficients by 0.5, the loop runs in 18 instruction cycles per sample.

Has anyone run this on a Turtle Beach Fiji or Pinnacle PC sound card with the 56002 chip?

-- 
Kenji Sokolov -- The Pipeline Internet Network
"Do not worship the copy."

From mdubois@cam.ac.uk Mon Sep 12 00:17:13 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!cam!mdubois
From: mdubois@cam.ac.uk (Mateo Dubois)
Newsgroups: comp.dsp
Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1994Sep12.001713.1543@cam.ac.uk>
Date: Mon, 12 Sep 1994 00:17:13 GMT
References: <1994Sep10.025913.9255@pipeline.com>
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In article <1994Sep10.025913.9255@pipeline.com>, ksokolov@pipeline.com (Kenji Sokolov) writes:
> 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.

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

-- 
Mateo Dubois -- University of Cambridge Computer Laboratory
"In theory there is no difference between theory and practice."

From mbrennan@pipeline.com Mon Sep 12 08:18:13 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!mbrennan
From: mbrennan@pipeline.com (Matthias Brennan)
Newsgroups: comp.dsp
Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1994Sep12.081813.3145@pipeline.com>
Date: Mon, 12 Sep 1994 08:18:13 GMT
References: <1994Sep10.025913.9255@pipeline.com>
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In article <1994Sep10.025913.9255@pipeline.com>, ksokolov@pipeline.com (Kenji Sokolov) writes:
> Porting stardust.c to the NeXTcube and Atari Falcon DSP subsystems.

Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete.

-- 
Matthias Brennan
Tape trading list upon request. SASE required for international mail.

From mdubois@netcom.com Mon Sep 12 21:34:13 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!mdubois
From: mdubois@netcom.com (Mathieu Dubois)
Newsgroups: comp.dsp
Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1994Sep12.213413.2787@netcom.com>
Date: Mon, 12 Sep 1994 21:34:13 GMT
References: <1994Sep10.025913.9255@pipeline.com> <1994Sep12.081813.3145@pipeline.com>
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In article <1994Sep12.081813.3145@pipeline.com>, mbrennan@pipeline.com (Matthias Brennan) writes:
> Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete.

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

-- 
Mathieu Dubois
Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services.
------------------------------------------------------------

From eschneider@uni-hamburg.de Wed Sep 14 08:06:13 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!eschneider
From: eschneider@uni-hamburg.de (Élodie Schneider)
Newsgroups: comp.dsp
Subject: Re: [INFO] Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1994Sep14.080613.9895@uni-hamburg.de>
Date: Wed, 14 Sep 1994 08:06:13 GMT
References: <1994Sep10.025913.9255@pipeline.com> <1994Sep12.081813.3145@pipeline.com> <1994Sep12.213413.2787@netcom.com>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1994Sep12.213413.2787@netcom.com>, mdubois@netcom.com (Mathieu Dubois) writes:
> Beautiful assembly code! The 24-bit word size of the 56001 is tailor-made for high-precision audio filtering.

Real programmers write in C, not arcane DSP microcode. With Pentium chips hitting 100 MHz, dedicated DSPs are obsolete.

-- 
Élodie Schneider -- Universität Hamburg Fachbereich Informatik
"Do not worship the copy."