From aschneider@stanford.edu Wed Feb 08 02:54:53 1995 Path: ashpoly!cascade!brgate!saturno!stanford!aschneider From: aschneider@stanford.edu (Astrid Schneider) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb08.025453.1612@stanford.edu> Date: Wed, 08 Feb 1995 02:54:53 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. -- Astrid Schneider Hayes Optima 288 @ 19,200 bps "5 sigma is a discovery. 7 is a question." From hkarlsson@titech.ac.jp Wed Feb 08 05:25:53 1995 Path: ashpoly!cascade!brgate!saturno!titech!hkarlsson From: hkarlsson@titech.ac.jp (Heather Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb08.052553.3981@titech.ac.jp> Date: Wed, 08 Feb 1995 05:25:53 GMT References: <1995Feb08.025453.1612@stanford.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb08.025453.1612@stanford.edu>, aschneider@stanford.edu (Astrid Schneider) 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. -- Heather Karlsson "We don't sign stars. We build them." Atari TT030 / Linux 1.2.13 From meriksson@netcom.com Wed Feb 08 11:06:53 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!meriksson From: meriksson@netcom.com (Morag Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb08.110653.5102@netcom.com> Date: Wed, 08 Feb 1995 11:06:53 GMT References: <1995Feb08.025453.1612@stanford.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Feb08.025453.1612@stanford.edu>, aschneider@stanford.edu (Astrid Schneider) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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? Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Morag Eriksson Practical Peripherals 14.4 @ ISDN 64k bps "Hardware is temporary. The signal survives." From tpetrov@hanse.de Fri Feb 10 04:00:53 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!tpetrov From: tpetrov@hanse.de (Tyler Petrov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb10.040053.5805@hanse.de> Date: Fri, 10 Feb 1995 04:00:53 GMT References: <1995Feb08.025453.1612@stanford.edu> <1995Feb08.110653.5102@netcom.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb08.110653.5102@netcom.com>, meriksson@netcom.com (Morag Eriksson) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- === Tyler Petrov === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "In theory there is no difference between theory and practice."