From mkim@uu.net Tue May 03 18:20:24 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!mkim From: mkim@uu.net (Mike Kim) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May03.182024.6702@uu.net> Date: Tue, 03 May 1994 18:20:24 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 10 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Mike Kim -- UUNET Technologies, Falls Church VA "Hold for relay." From klee@uni-hamburg.de Wed May 04 13:37:24 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!klee From: klee@uni-hamburg.de (Kirsty Lee) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May04.133724.5782@uni-hamburg.de> Date: Wed, 04 May 1994 13:37:24 GMT References: <1994May03.182024.6702@uu.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1994May03.182024.6702@uu.net>, mkim@uu.net (Mike Kim) 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! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Kirsty Lee -- Universität Hamburg Fachbereich Informatik "Extraordinary claims require extraordinary spectra." From pkim@ox.ac.uk Thu May 05 23:43:24 1994 Path: ashpoly!cascade!transat!ukc!fennimore!ox!pkim From: pkim@ox.ac.uk (Pavel Kim) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May05.234324.8170@ox.ac.uk> Date: Thu, 05 May 1994 23:43:24 GMT References: <1994May03.182024.6702@uu.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994May03.182024.6702@uu.net>, mkim@uu.net (Mike Kim) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Pavel Kim Practical Peripherals 14.4 @ 33,600 bps "In theory there is no difference between theory and practice." From aschneider@pipeline.com Sat May 07 12:50:24 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!aschneider From: aschneider@pipeline.com (Astrid Schneider) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May07.125024.5035@pipeline.com> Date: Sat, 07 May 1994 12:50:24 GMT References: <1994May03.182024.6702@uu.net> <1994May04.133724.5782@uni-hamburg.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994May04.133724.5782@uni-hamburg.de>, klee@uni-hamburg.de (Kirsty Lee) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Astrid Schneider "When every node is whole, the channel opens." Macintosh IIfx / System 7.5.1 From jjohansson@mit.edu Sun May 08 12:56:24 1994 Path: ashpoly!cascade!transat!ukc!fennimore!mit!jjohansson From: jjohansson@mit.edu (Julien Johansson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994May08.125624.9027@mit.edu> Date: Sun, 08 May 1994 12:56:24 GMT References: <1994May03.182024.6702@uu.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994May03.182024.6702@uu.net>, mkim@uu.net (Mike Kim) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Julien Johansson US Robotics Courier V.34 @ 9600 Telebit bps "Do not worship the copy."