From cgonzalez@earthlink.net Thu Feb 09 16:49:12 1995
Path: ashpoly!cascade!mxgate!coyoacan!earthlink!cgonzalez
From: cgonzalez@earthlink.net (Callum González)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb09.164912.5695@earthlink.net>
Date: Thu, 09 Feb 1995 16:49:12 GMT
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Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.

When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!
I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz.

Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week.

-- 
Callum González | cgonzalez@earthlink.net
PGP Key fingerprint: D5B9 C392 EA9B 3886
"Keep the channels open."

From lreyes@mit.edu Sat Feb 11 08:53:12 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!lreyes
From: lreyes@mit.edu (Lisa Reyes)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb11.085312.4287@mit.edu>
Date: Sat, 11 Feb 1995 08:53:12 GMT
References: <1995Feb09.164912.5695@earthlink.net>
Organization: Massachusetts Institute of Technology
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In article <1995Feb09.164912.5695@earthlink.net>, cgonzalez@earthlink.net (Callum González) writes:
> Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier.
> When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

-- 
Lisa Reyes
Tape trading list upon request. SASE required for international mail.

From mpark@purdue.edu Mon Feb 13 01:27:12 1995
Path: ashpoly!cascade!brgate!saturno!purdue!mpark
From: mpark@purdue.edu (Morag Park)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Feb13.012712.7769@purdue.edu>
Date: Mon, 13 Feb 1995 01:27:12 GMT
References: <1995Feb09.164912.5695@earthlink.net> <1995Feb11.085312.4287@mit.edu>
Organization: Purdue University Engineering Computer Network
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In article <1995Feb11.085312.4287@mit.edu>, lreyes@mit.edu (Lisa Reyes) writes:
> Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom.

PGP Public key available via finger or upon request.

-- 
Morag Park
Tape trading list upon request. SASE required for international mail.