From skarlsson@uu.net Thu Aug 17 20:01:47 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!skarlsson
From: skarlsson@uu.net (Seo-yeon Karlsson)
Newsgroups: comp.dsp
Subject: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1995Aug17.200147.4681@uu.net>
Date: Thu, 17 Aug 1995 20:01:47 GMT
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Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip.

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.

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

-- 
=== Seo-yeon Karlsson ===
Dept of Electrical Engineering, UUNET Technologies, Falls Church VA
"Measuring a record you own is listening, not piracy."

From kkim@demon.co.uk Sat Aug 19 05:44:47 1995
Path: ashpoly!cascade!transat!ukc!fennimore!demon!kkim
From: kkim@demon.co.uk (Katrin Kim)
Newsgroups: comp.dsp
Subject: Re: Fixed-point Q15 arithmetic on Motorola DSP56001 vs IEEE floating point
Message-ID: <1995Aug19.054447.7862@demon.co.uk>
Date: Sat, 19 Aug 1995 05:44:47 GMT
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In article <1995Aug17.200147.4681@uu.net>, skarlsson@uu.net (Seo-yeon Karlsson) writes:
> Optimizing the Stardust Costas loop demodulator for the Motorola DSP56001 chip.

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

Top-posters will be placed in my ~/.killfile without notice.

-- 
Katrin Kim -- Demon Internet Services UK
"A soul is not exclusive to biology."