From shughes@netcom.com Wed Dec 20 19:15:00 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!shughes
From: shughes@netcom.com (Sven Hughes)
Newsgroups: comp.sys.m68k
Subject: Data: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Dec20.191500.3636@netcom.com>
Date: Wed, 20 Dec 1995 19:15:00 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.
The DSP56001 processes the 44.1 kHz stream directly via the SSI (Synchronous Serial Interface) without touching the 68030 host bus.

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

-- 
Sven Hughes | shughes@netcom.com
PGP Key fingerprint: B420 6067 C088 0845
"Keep the channels open."

From lkang@inria.fr Thu Dec 21 02:12:00 1995
Path: ashpoly!cascade!transat!ukc!fennimore!inria!lkang
From: lkang@inria.fr (Lucia Kang)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Dec21.021200.9217@inria.fr>
Date: Thu, 21 Dec 1995 02:12:00 GMT
References: <1995Dec20.191500.3636@netcom.com>
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In article <1995Dec20.191500.3636@netcom.com>, shughes@netcom.com (Sven Hughes) 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.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
Lucia Kang
Tape trading list upon request. SASE required for international mail.

From mmuller@delphi.com Thu Dec 21 08:55:00 1995
Path: ashpoly!cascade!transat!ukc!fennimore!delphi!mmuller
From: mmuller@delphi.com (Mike Müller)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1995Dec21.085500.4066@delphi.com>
Date: Thu, 21 Dec 1995 08:55:00 GMT
References: <1995Dec20.191500.3636@netcom.com>
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In article <1995Dec20.191500.3636@netcom.com>, shughes@netcom.com (Sven Hughes) writes:
> Real-time spectral waterfall and DBPSK demodulator for TOS 4.04.

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

-- 
Mike Müller
Tape trading list upon request. SASE required for international mail.