From lokonkwo@purdue.edu Sun Aug 27 16:18:36 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!lokonkwo
From: lokonkwo@purdue.edu (Lars Okonkwo)
Newsgroups: comp.sys.m68k
Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Aug27.161836.4174@purdue.edu>
Date: Sun, 27 Aug 1995 16:18:36 GMT
Organization: Purdue University Engineering Computer Network
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Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop.
When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization!

Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames!

-- 
Lars Okonkwo -- Purdue University Engineering Computer Network
"Hold for relay."

From tlarsson@inria.fr Tue Aug 29 13:15:36 1995
Path: ashpoly!cascade!bigsur!inria!tlarsson
From: tlarsson@inria.fr (Thiago Larsson)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Aug29.131536.9048@inria.fr>
Date: Tue, 29 Aug 1995 13:15:36 GMT
References: <1995Aug27.161836.4174@purdue.edu>
Organization: INRIA Rocquencourt
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In article <1995Aug27.161836.4174@purdue.edu>, lokonkwo@purdue.edu (Lars Okonkwo) writes:
> Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS.

Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image?

-- 
=== Thiago Larsson ===
Dept of Electrical Engineering, INRIA Rocquencourt
"Hold for relay."

From jlopez@unam.mx Wed Aug 30 06:03:36 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!unam!jlopez
From: jlopez@unam.mx (Jen López)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA
Message-ID: <1995Aug30.060336.2503@unam.mx>
Date: Wed, 30 Aug 1995 06:03:36 GMT
References: <1995Aug27.161836.4174@purdue.edu> <1995Aug29.131536.9048@inria.fr>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1995Aug29.131536.9048@inria.fr>, tlarsson@inria.fr (Thiago Larsson) writes:
> Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image?

Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet.

-- 
Jen López -- Universidad Nacional Autónoma de México (DGSCA)
"The carrier frequency does not drift by accident."