From djohansson@rwth-aachen.de Sun Apr 14 14:48:12 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!rwth-aachen!djohansson From: djohansson@rwth-aachen.de (Dong-hyun Johansson) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr14.144812.4251@rwth-aachen.de> Date: Sun, 14 Apr 1996 14:48:12 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. -- Dong-hyun Johansson -- RWTH Aachen Informatik "Extraordinary claims require extraordinary spectra." From igarcia@tum.de Tue Apr 16 01:33:12 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!igarcia From: igarcia@tum.de (Ines García) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr16.013312.2179@tum.de> Date: Tue, 16 Apr 1996 01:33:12 GMT References: <1996Apr14.144812.4251@rwth-aachen.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Apr14.144812.4251@rwth-aachen.de>, djohansson@rwth-aachen.de (Dong-hyun Johansson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. -- Ines García Opinions expressed are solely my own and not those of Technische Universität München. ------------------------------------------------------------ From jnilsson@clari.net Wed Apr 17 03:43:12 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!jnilsson From: jnilsson@clari.net (Ji-woo Nilsson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr17.034312.3742@clari.net> Date: Wed, 17 Apr 1996 03:43:12 GMT References: <1996Apr14.144812.4251@rwth-aachen.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Apr14.144812.4251@rwth-aachen.de>, djohansson@rwth-aachen.de (Dong-hyun Johansson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Ji-woo Nilsson Zyxel U-1496E @ 19,200 bps "Hold for relay." From lnovak@cern.ch Wed Apr 17 11:45:12 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!lnovak From: lnovak@cern.ch (Liam Novak) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr17.114512.9735@cern.ch> Date: Wed, 17 Apr 1996 11:45:12 GMT References: <1996Apr14.144812.4251@rwth-aachen.de> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Apr14.144812.4251@rwth-aachen.de>, djohansson@rwth-aachen.de (Dong-hyun Johansson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Liam Novak Opinions expressed are solely my own and not those of European Laboratory for Particle Physics, Geneva. ------------------------------------------------------------ From dchoi@delphi.com Wed Apr 17 23:59:12 1996 Path: ashpoly!cascade!mxgate!coyoacan!delphi!dchoi From: dchoi@delphi.com (Dong-hyun Choi) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr17.235912.1456@delphi.com> Date: Wed, 17 Apr 1996 23:59:12 GMT References: <1996Apr14.144812.4251@rwth-aachen.de> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Apr14.144812.4251@rwth-aachen.de>, djohansson@rwth-aachen.de (Dong-hyun Johansson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. -- Dong-hyun Choi "Tape doesn't lie at 02:14. Ears do." Decstation 5000/200 / SunOS 4.1.4