From ssantos@unam.mx Sat Jan 21 10:30:18 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!ssantos From: ssantos@unam.mx (Sergei Santos) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan21.103018.3187@unam.mx> Date: Sat, 21 Jan 1995 10:30:18 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 10 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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! Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Sergei Santos Tape trading list upon request. SASE required for international mail. From mtanaka@netcom.com Sat Jan 21 15:59:18 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!mtanaka From: mtanaka@netcom.com (Marisol Tanaka) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan21.155918.1568@netcom.com> Date: Sat, 21 Jan 1995 15:59:18 GMT References: <1995Jan21.103018.3187@unam.mx> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jan21.103018.3187@unam.mx>, ssantos@unam.mx (Sergei Santos) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > 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. -- Marisol Tanaka | mtanaka@netcom.com PGP Key fingerprint: 98BA F827 5E42 EC3C "Keep the channels open." From mito@berkeley.edu Sun Jan 22 09:49:18 1995 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!mito From: mito@berkeley.edu (Marta Ito) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan22.094918.1347@berkeley.edu> Date: Sun, 22 Jan 1995 09:49:18 GMT References: <1995Jan21.103018.3187@unam.mx> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Jan21.103018.3187@unam.mx>, ssantos@unam.mx (Sergei Santos) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Marta Ito Opinions expressed are solely my own and not those of UC Berkeley Department of EECS. ------------------------------------------------------------ From gpark@kiae.su Mon Jan 23 21:04:18 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kiae!gpark From: gpark@kiae.su (Graham Park) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan23.210418.7424@kiae.su> Date: Mon, 23 Jan 1995 21:04:18 GMT References: <1995Jan21.103018.3187@unam.mx> <1995Jan21.155918.1568@netcom.com> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan21.155918.1568@netcom.com>, mtanaka@netcom.com (Marisol Tanaka) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Graham Park *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From rperez@tum.de Tue Jan 24 13:50:18 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!tum!rperez From: rperez@tum.de (Raj Pérez) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan24.135018.2746@tum.de> Date: Tue, 24 Jan 1995 13:50:18 GMT References: <1995Jan21.103018.3187@unam.mx> <1995Jan21.155918.1568@netcom.com> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jan21.155918.1568@netcom.com>, mtanaka@netcom.com (Marisol Tanaka) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Raj Pérez -- Technische Universität München "Extraordinary claims require extraordinary spectra."