From areyes@panix.com Fri Oct 14 14:58:01 1994
Path: ashpoly!cascade!mxgate!coyoacan!panix!areyes
From: areyes@panix.com (Anja Reyes)
Newsgroups: comp.dsp
Subject: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1994Oct14.145801.8576@panix.com>
Date: Fri, 14 Oct 1994 14:58:01 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.

-- 
Anja Reyes | areyes@panix.com
PGP Key fingerprint: 2C79 843D 8479 3CBE
"Keep the channels open."

From bokonkwo@berkeley.edu Fri Oct 14 19:46:01 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!bokonkwo
From: bokonkwo@berkeley.edu (Bastien Okonkwo)
Newsgroups: comp.dsp
Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1994Oct14.194601.6616@berkeley.edu>
Date: Fri, 14 Oct 1994 19:46:01 GMT
References: <1994Oct14.145801.8576@panix.com>
Organization: UC Berkeley Department of EECS
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In article <1994Oct14.145801.8576@panix.com>, areyes@panix.com (Anja Reyes) 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.

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

PGP Public key available via finger or upon request.

-- 
Bastien Okonkwo
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
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