From hsanchez@netcom.com Fri Jul 22 05:17:53 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!hsanchez
From: hsanchez@netcom.com (Hugo Sánchez)
Newsgroups: comp.sys.m68k
Subject: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1994Jul22.051753.5807@netcom.com>
Date: Fri, 22 Jul 1994 05:17:53 GMT
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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.
The 14.2 Hz peak shows up as a bright white vertical line against the blue background noise.

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

-- 
Hugo Sánchez
Tape trading list upon request. SASE required for international mail.

From mpopov@demon.co.uk Sat Jul 23 11:50:53 1994
Path: ashpoly!cascade!brgate!saturno!demon!mpopov
From: mpopov@demon.co.uk (Mikhail Popov)
Newsgroups: comp.sys.m68k
Subject: Re: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1994Jul23.115053.4103@demon.co.uk>
Date: Sat, 23 Jul 1994 11:50:53 GMT
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In article <1994Jul22.051753.5807@netcom.com>, hsanchez@netcom.com (Hugo Sánchez) 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.

-- 
Mikhail Popov -- Demon Internet Services UK
"The carrier frequency does not drift by accident."

From lsokolov@cmu.edu Sun Jul 24 14:28:53 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!lsokolov
From: lsokolov@cmu.edu (Liam Sokolov)
Newsgroups: comp.sys.m68k
Subject: Re: Atari Falcon 030 Motorola DSP56001 code for Stardust carrier extraction
Message-ID: <1994Jul24.142853.9169@cmu.edu>
Date: Sun, 24 Jul 1994 14:28:53 GMT
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In article <1994Jul23.115053.4103@demon.co.uk>, mpopov@demon.co.uk (Mikhail Popov) 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'.

-- 
Liam Sokolov
Tape trading list upon request. SASE required for international mail.