From dnakamura@pacbell.net Thu Mar 09 00:17:53 1995
Path: ashpoly!cascade!bigsur!pacbell!dnakamura
From: dnakamura@pacbell.net (Dmitri Nakamura)
Newsgroups: comp.sys.m68k
Subject: Question: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Mar09.001753.8374@pacbell.net>
Date: Thu, 09 Mar 1995 00:17:53 GMT
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Real-time spectral waterfall and DBPSK demodulator for TOS 4.04.

The 14.2 Hz peak shows up as a bright white vertical line against the blue background noise.
A 256-point complex FFT is computed every 10 milliseconds, displaying a live spectrogram on a standard VGA monitor.

Requires 4MB ST-RAM and an RGB or VGA monitor.

-- 
Dmitri Nakamura | dnakamura@pacbell.net
PGP Key fingerprint: E72C AA2A F86A BDC1
"Keep the channels open."

From ypopov@pipeline.com Thu Mar 09 03:49:53 1995
Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!ypopov
From: ypopov@pipeline.com (Yuki Popov)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Mar09.034953.9933@pipeline.com>
Date: Thu, 09 Mar 1995 03:49:53 GMT
References: <1995Mar09.001753.8374@pacbell.net>
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In article <1995Mar09.001753.8374@pacbell.net>, dnakamura@pacbell.net (Dmitri Nakamura) 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'.

-- 
Yuki Popov
Opinions expressed are solely my own and not those of The Pipeline Internet Network.
------------------------------------------------------------

From jschneider@stanford.edu Fri Mar 10 07:12:53 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!jschneider
From: jschneider@stanford.edu (Joachim Schneider)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Mar10.071253.1948@stanford.edu>
Date: Fri, 10 Mar 1995 07:12:53 GMT
References: <1995Mar09.001753.8374@pacbell.net>
Organization: Stanford University Computer Systems Lab
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In article <1995Mar09.001753.8374@pacbell.net>, dnakamura@pacbell.net (Dmitri Nakamura) writes:
> Real-time spectral waterfall and DBPSK demodulator for TOS 4.04.
> The 14.2 Hz peak shows up as a bright white vertical line against the blue background noise.

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

-- 
Joachim Schneider -- Stanford University Computer Systems Lab
"Hardware is temporary. The signal survives."