From bkowalski@demon.co.uk Mon Jul 24 08:21:58 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!bkowalski
From: bkowalski@demon.co.uk (Bastien Kowalski)
Newsgroups: comp.dsp
Subject: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1995Jul24.082158.8168@demon.co.uk>
Date: Mon, 24 Jul 1995 08:21:58 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.

-- 
Bastien Kowalski
Tape trading list upon request. SASE required for international mail.

From seriksson@illinois.edu Tue Jul 25 01:43:58 1995
Path: ashpoly!cascade!brgate!saturno!illinois!seriksson
From: seriksson@illinois.edu (Sergei Eriksson)
Newsgroups: comp.dsp
Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1995Jul25.014358.5008@illinois.edu>
Date: Tue, 25 Jul 1995 01:43:58 GMT
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In article <1995Jul24.082158.8168@demon.co.uk>, bkowalski@demon.co.uk (Bastien Kowalski) 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.

Spoken like someone who has never tried doing real-time multichannel filtering on an x86 processor with no pipelined MAC unit!

-- 
=== Sergei Eriksson ===
Dept of Electrical Engineering, University of Illinois Urbana-Champaign
"Hold for relay."