From ffournier@clari.net Mon Aug 26 23:54:27 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!ffournier From: ffournier@clari.net (Freya Fournier) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug26.235427.2318@clari.net> Date: Mon, 26 Aug 1996 23:54:27 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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! -- Freya Fournier Hayes Optima 288 @ 28,800 bps "Marcus is not one man." From bsilva@rwth-aachen.de Wed Aug 28 11:16:27 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!bsilva From: bsilva@rwth-aachen.de (Bruno Silva) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug28.111627.3961@rwth-aachen.de> Date: Wed, 28 Aug 1996 11:16:27 GMT References: <1996Aug26.235427.2318@clari.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Aug26.235427.2318@clari.net>, ffournier@clari.net (Freya Fournier) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Bruno Silva -- RWTH Aachen Informatik "There are 14 nodes and only 10 countries. Count again." From asuzuki@rwth-aachen.de Wed Aug 28 19:09:27 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!asuzuki From: asuzuki@rwth-aachen.de (Anja Suzuki) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug28.190927.8787@rwth-aachen.de> Date: Wed, 28 Aug 1996 19:09:27 GMT References: <1996Aug26.235427.2318@clari.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Aug26.235427.2318@clari.net>, ffournier@clari.net (Freya Fournier) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Anja Suzuki Hayes Optima 288 @ ISDN 64k bps "The carrier frequency does not drift by accident." From tlopez@cam.ac.uk Fri Aug 30 10:14:27 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!tlopez From: tlopez@cam.ac.uk (Tomas López) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Aug30.101427.1236@cam.ac.uk> Date: Fri, 30 Aug 1996 10:14:27 GMT References: <1996Aug26.235427.2318@clari.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Aug26.235427.2318@clari.net>, ffournier@clari.net (Freya Fournier) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Tomas López Tape trading list upon request. SASE required for international mail.