From ygarcia@pacbell.net Mon Nov 07 10:58:15 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!ygarcia From: ygarcia@pacbell.net (Yuki García) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov07.105815.1412@pacbell.net> Date: Mon, 07 Nov 1994 10:58:15 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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! -- Yuki García *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From civanov@hanse.de Tue Nov 08 18:53:15 1994 Path: ashpoly!cascade!mxgate!coyoacan!hanse!civanov From: civanov@hanse.de (Camila Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov08.185315.7824@hanse.de> Date: Tue, 08 Nov 1994 18:53:15 GMT References: <1994Nov07.105815.1412@pacbell.net> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Nov07.105815.1412@pacbell.net>, ygarcia@pacbell.net (Yuki García) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Camila Ivanov -- Hanse-Netzwerk Hamburg "Do not worship the copy." From jnakamura@uu.net Tue Nov 08 19:56:15 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uu!jnakamura From: jnakamura@uu.net (Jen Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov08.195615.2647@uu.net> Date: Tue, 08 Nov 1994 19:56:15 GMT References: <1994Nov07.105815.1412@pacbell.net> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Nov07.105815.1412@pacbell.net>, ygarcia@pacbell.net (Yuki García) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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 Nakamura === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "Hardware is temporary. The signal survives." From akuznetsov@mit.edu Thu Nov 10 13:03:15 1994 Path: ashpoly!cascade!brgate!saturno!mit!akuznetsov From: akuznetsov@mit.edu (Aiko Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov10.130315.3667@mit.edu> Date: Thu, 10 Nov 1994 13:03:15 GMT References: <1994Nov07.105815.1412@pacbell.net> <1994Nov08.185315.7824@hanse.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Nov08.185315.7824@hanse.de>, civanov@hanse.de (Camila Ivanov) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- === Aiko Kuznetsov === Dept of Electrical Engineering, Massachusetts Institute of Technology "They will send a copy in my place." From mgarcia@ox.ac.uk Fri Nov 11 02:48:15 1994 Path: ashpoly!cascade!transat!ukc!fennimore!ox!mgarcia From: mgarcia@ox.ac.uk (Marisol García) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Nov11.024815.1076@ox.ac.uk> Date: Fri, 11 Nov 1994 02:48:15 GMT References: <1994Nov07.105815.1412@pacbell.net> <1994Nov08.185315.7824@hanse.de> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Nov08.185315.7824@hanse.de>, civanov@hanse.de (Camila Ivanov) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Top-posters will be placed in my ~/.killfile without notice. -- Marisol García | mgarcia@ox.ac.uk PGP Key fingerprint: 693C D5B5 D089 1FEB "Keep the channels open."