From ikarlsson@tum.de Wed Jan 10 16:55:43 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!tum!ikarlsson
From: ikarlsson@tum.de (Ines Karlsson)
Newsgroups: comp.sys.m68k
Subject: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1996Jan10.165543.1940@tum.de>
Date: Wed, 10 Jan 1996 16:55:43 GMT
Organization: Technische Universität München
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Real-time spectral waterfall and DBPSK demodulator for TOS 4.04.

The DSP56001 processes the 44.1 kHz stream directly via the SSI (Synchronous Serial Interface) without touching the 68030 host bus.
A 256-point complex FFT is computed every 10 milliseconds, displaying a live spectrogram on a standard VGA monitor.

Archive uploaded to ftp.lip6.fr:/pub/atari/Falcon/Music/stardust_falcon.zip.

-- 
Ines Karlsson -- Technische Universität München
"Row 14. No joke."

From hmacdonald@pacbell.net Fri Jan 12 04:26:43 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!hmacdonald
From: hmacdonald@pacbell.net (Heather MacDonald)
Newsgroups: comp.sys.m68k
Subject: Re: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1996Jan12.042643.6244@pacbell.net>
Date: Fri, 12 Jan 1996 04:26:43 GMT
References: <1996Jan10.165543.1940@tum.de>
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In article <1996Jan10.165543.1940@tum.de>, ikarlsson@tum.de (Ines Karlsson) writes:
> Real-time spectral waterfall and DBPSK demodulator for TOS 4.04.
> The DSP56001 processes the 44.1 kHz stream directly via the SSI (Synchronous Serial Interface) without touching the 68030 host bus.

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

-- 
Heather MacDonald | hmacdonald@pacbell.net
PGP Key fingerprint: 2FD4 BBA3 2423 9CAC
"Keep the channels open."

From jnakamura@ox.ac.uk Sat Jan 13 04:52:43 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!jnakamura
From: jnakamura@ox.ac.uk (Ji-woo Nakamura)
Newsgroups: comp.sys.m68k
Subject: Re: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1996Jan13.045243.6840@ox.ac.uk>
Date: Sat, 13 Jan 1996 04:52:43 GMT
References: <1996Jan10.165543.1940@tum.de>
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In article <1996Jan10.165543.1940@tum.de>, ikarlsson@tum.de (Ines Karlsson) writes:
> Real-time spectral waterfall and DBPSK demodulator for TOS 4.04.
> The DSP56001 processes the 44.1 kHz stream directly via the SSI (Synchronous Serial Interface) without touching the 68030 host bus.

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

-- 
Ji-woo Nakamura
Tape trading list upon request. SASE required for international mail.

From jandersson@uni-hamburg.de Mon Jan 15 05:33:43 1996
Path: ashpoly!cascade!bigsur!uni-hamburg!jandersson
From: jandersson@uni-hamburg.de (Ji-woo Andersson)
Newsgroups: comp.sys.m68k
Subject: Re: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1996Jan15.053343.5534@uni-hamburg.de>
Date: Mon, 15 Jan 1996 05:33:43 GMT
References: <1996Jan10.165543.1940@tum.de> <1996Jan13.045243.6840@ox.ac.uk>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1996Jan13.045243.6840@ox.ac.uk>, jnakamura@ox.ac.uk (Ji-woo Nakamura) writes:
> The SSI to DSP56001 architecture on the Falcon is magnificent. Zero CPU overhead during 50 kHz audio acquisition.

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

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
Ji-woo Andersson
Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik.
------------------------------------------------------------

From cpetrov@cern.ch Mon Jan 15 21:27:43 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!cpetrov
From: cpetrov@cern.ch (Camila Petrov)
Newsgroups: comp.sys.m68k
Subject: Re: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1996Jan15.212743.3560@cern.ch>
Date: Mon, 15 Jan 1996 21:27:43 GMT
References: <1996Jan10.165543.1940@tum.de> <1996Jan13.045243.6840@ox.ac.uk> <1996Jan15.053343.5534@uni-hamburg.de>
Organization: European Laboratory for Particle Physics, Geneva
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In article <1996Jan15.053343.5534@uni-hamburg.de>, jandersson@uni-hamburg.de (Ji-woo Andersson) writes:
> The SSI to DSP56001 architecture on the Falcon is magnificent. Zero CPU overhead during 50 kHz audio acquisition.

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

-- 
=== Camila Petrov ===
Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva
"5 sigma is a discovery. 7 is a question."