From imuller@illinois.edu Tue Jan 10 11:41:53 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!imuller
From: imuller@illinois.edu (Ines Müller)
Newsgroups: comp.dsp
Subject: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1995Jan10.114153.8101@illinois.edu>
Date: Tue, 10 Jan 1995 11:41:53 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.
This leaves over 95% of the DSP56001's 16.5 MIPS available for other audio tasks.

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

-- 
Ines Müller
Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign.
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From emacdonald@stanford.edu Thu Jan 12 09:58:53 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!emacdonald
From: emacdonald@stanford.edu (Élodie MacDonald)
Newsgroups: comp.dsp
Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1995Jan12.095853.1707@stanford.edu>
Date: Thu, 12 Jan 1995 09:58:53 GMT
References: <1995Jan10.114153.8101@illinois.edu>
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In article <1995Jan10.114153.8101@illinois.edu>, imuller@illinois.edu (Ines Müller) 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.

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

-- 
Élodie MacDonald
Tape trading list upon request. SASE required for international mail.