From pmacdonald@ox.ac.uk Tue Jan 03 10:40:35 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!pmacdonald From: pmacdonald@ox.ac.uk (Pavel MacDonald) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan03.104035.7400@ox.ac.uk> Date: Tue, 03 Jan 1995 10:40:35 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Pavel MacDonald "Tape doesn't lie at 02:14. Ears do." Sun 3/60 (SunOS 4.1.1) / TOS 4.04 From msantos@titech.ac.jp Thu Jan 05 09:26:35 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!msantos From: msantos@titech.ac.jp (Mei Santos) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan05.092635.7219@titech.ac.jp> Date: Thu, 05 Jan 1995 09:26:35 GMT References: <1995Jan03.104035.7400@ox.ac.uk> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan03.104035.7400@ox.ac.uk>, pmacdonald@ox.ac.uk (Pavel MacDonald) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Mei Santos -- Tokyo Institute of Technology Computer Centre "5 sigma is a discovery. 7 is a question." From kbrennan@netcom.com Sat Jan 07 10:26:35 1995 Path: ashpoly!cascade!transat!ukc!fennimore!netcom!kbrennan From: kbrennan@netcom.com (Kenji Brennan) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan07.102635.6892@netcom.com> Date: Sat, 07 Jan 1995 10:26:35 GMT References: <1995Jan03.104035.7400@ox.ac.uk> <1995Jan05.092635.7219@titech.ac.jp> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan05.092635.7219@titech.ac.jp>, msantos@titech.ac.jp (Mei Santos) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- === Kenji Brennan === Dept of Electrical Engineering, NETCOM On-Line Communication Services "A soul is not exclusive to biology." From ahughes@mindspring.com Mon Jan 09 12:11:35 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!ahughes From: ahughes@mindspring.com (Andrei Hughes) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan09.121135.5361@mindspring.com> Date: Mon, 09 Jan 1995 12:11:35 GMT References: <1995Jan03.104035.7400@ox.ac.uk> <1995Jan05.092635.7219@titech.ac.jp> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan05.092635.7219@titech.ac.jp>, msantos@titech.ac.jp (Mei Santos) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- === Andrei Hughes === Dept of Electrical Engineering, MindSpring Enterprises "A soul is not exclusive to biology." From gmoreau@illinois.edu Mon Jan 09 13:25:35 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!gmoreau From: gmoreau@illinois.edu (Göran Moreau) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan09.132535.7142@illinois.edu> Date: Mon, 09 Jan 1995 13:25:35 GMT References: <1995Jan03.104035.7400@ox.ac.uk> <1995Jan05.092635.7219@titech.ac.jp> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan05.092635.7219@titech.ac.jp>, msantos@titech.ac.jp (Mei Santos) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- === Göran Moreau === Dept of Electrical Engineering, University of Illinois Urbana-Champaign "Do not worship the copy."