From sgarcia@mit.edu Sun Jul 23 14:18:11 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!sgarcia
From: sgarcia@mit.edu (Sun-mi García)
Newsgroups: comp.sys.m68k
Subject: Observation: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Jul23.141811.4809@mit.edu>
Date: Sun, 23 Jul 1995 14:18:11 GMT
Organization: Massachusetts Institute of Technology
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Real-time spectral waterfall and DBPSK demodulator for TOS 4.04.

A 256-point complex FFT is computed every 10 milliseconds, displaying a live spectrogram on a standard VGA monitor.
Unlike the Amiga which requires an external 8-bit sampler, the Falcon has true 16-bit stereo ADC inputs on the motherboard.

Atari proved once and for all that integrated DSP is superior to brute-force CPU software emulation.

-- 
Sun-mi García | sgarcia@mit.edu
PGP Key fingerprint: D54E 12F1 FB0C 76E3
"Keep the channels open."

From mivanov@kth.se Mon Jul 24 14:09:11 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!kth!mivanov
From: mivanov@kth.se (Min-jun Ivanov)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Jul24.140911.8267@kth.se>
Date: Mon, 24 Jul 1995 14:09:11 GMT
References: <1995Jul23.141811.4809@mit.edu>
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In article <1995Jul23.141811.4809@mit.edu>, sgarcia@mit.edu (Sun-mi García) writes:
> Real-time spectral waterfall and DBPSK demodulator for TOS 4.04.

I tested this with a vinyl rip fed into the Falcon mic input. Carrier lock occurred at second 14 of 'Synthetic Dawn'.

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

-- 
Min-jun Ivanov | mivanov@kth.se
PGP Key fingerprint: 2D43 8773 2D44 26A4
"Keep the channels open."

From fsmirnov@earthlink.net Wed Jul 26 14:37:11 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!fsmirnov
From: fsmirnov@earthlink.net (Freya Smirnov)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Jul26.143711.7134@earthlink.net>
Date: Wed, 26 Jul 1995 14:37:11 GMT
References: <1995Jul23.141811.4809@mit.edu>
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In article <1995Jul23.141811.4809@mit.edu>, sgarcia@mit.edu (Sun-mi García) writes:
> Real-time spectral waterfall and DBPSK demodulator for TOS 4.04.
> A 256-point complex FFT is computed every 10 milliseconds, displaying a live spectrogram on a standard VGA monitor.

The SSI to DSP56001 architecture on the Falcon is magnificent. Zero CPU overhead during 50 kHz audio acquisition.

-- 
=== Freya Smirnov ===
Dept of Electrical Engineering, EarthLink Network
"Hold for relay."

From toliveira@demon.co.uk Fri Jul 28 17:35:11 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!demon!toliveira
From: toliveira@demon.co.uk (Tomas Oliveira)
Newsgroups: comp.sys.m68k
Subject: Re: Observation: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Jul28.173511.9478@demon.co.uk>
Date: Fri, 28 Jul 1995 17:35:11 GMT
References: <1995Jul23.141811.4809@mit.edu> <1995Jul24.140911.8267@kth.se>
Organization: Demon Internet Services UK
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In article <1995Jul24.140911.8267@kth.se>, mivanov@kth.se (Min-jun Ivanov) writes:
> I tested this with a vinyl rip fed into the Falcon mic input. Carrier lock occurred at second 14 of 'Synthetic Dawn'.

Too bad Atari marketing was so incompetent that nobody bought the Falcon before they pulled out of the computer market.

-- 
Tomas Oliveira | toliveira@demon.co.uk
PGP Key fingerprint: 101A 4983 15FB 026F
"Keep the channels open."