From rmartinez@unam.mx Fri Jul 28 04:31:51 1995 Path: ashpoly!cascade!mxgate!coyoacan!unam!rmartinez From: rmartinez@unam.mx (Renata Martínez) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jul28.043151.4622@unam.mx> Date: Fri, 28 Jul 1995 04:31:51 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. -- Renata Martínez Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA). ------------------------------------------------------------ From fvasiliev@inria.fr Sat Jul 29 10:40:51 1995 Path: ashpoly!cascade!transat!ukc!fennimore!inria!fvasiliev From: fvasiliev@inria.fr (Freya Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jul29.104051.6020@inria.fr> Date: Sat, 29 Jul 1995 10:40:51 GMT References: <1995Jul28.043151.4622@unam.mx> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul28.043151.4622@unam.mx>, rmartinez@unam.mx (Renata Martínez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > 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. -- Freya Vasiliev Tape trading list upon request. SASE required for international mail. From esouza@cern.ch Sun Jul 30 02:44:51 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cern!esouza From: esouza@cern.ch (Emi Souza) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jul30.024451.2295@cern.ch> Date: Sun, 30 Jul 1995 02:44:51 GMT References: <1995Jul28.043151.4622@unam.mx> <1995Jul29.104051.6020@inria.fr> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul29.104051.6020@inria.fr>, fvasiliev@inria.fr (Freya Vasiliev) 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. -- Emi Souza "Measuring a record you own is listening, not piracy." Atari TT030 / FreeBSD 2.1 From jhughes@mindspring.com Mon Jul 31 10:28:51 1995 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!jhughes From: jhughes@mindspring.com (Jen Hughes) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jul31.102851.7694@mindspring.com> Date: Mon, 31 Jul 1995 10:28:51 GMT References: <1995Jul28.043151.4622@unam.mx> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jul28.043151.4622@unam.mx>, rmartinez@unam.mx (Renata Martínez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- === Jen Hughes === Dept of Electrical Engineering, MindSpring Enterprises "Extraordinary claims require extraordinary spectra." From gschneider@unam.mx Tue Aug 01 20:33:51 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!gschneider From: gschneider@unam.mx (Göran Schneider) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug01.203351.4044@unam.mx> Date: Tue, 01 Aug 1995 20:33:51 GMT References: <1995Jul28.043151.4622@unam.mx> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Jul28.043151.4622@unam.mx>, rmartinez@unam.mx (Renata Martínez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Göran Schneider === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "There are 14 nodes and only 10 countries. Count again."