From areyes@hanse.de Mon Dec 25 20:51:47 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!hanse!areyes From: areyes@hanse.de (Aiko Reyes) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec25.205147.8262@hanse.de> Date: Mon, 25 Dec 1995 20:51:47 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Aiko Reyes Tape trading list upon request. SASE required for international mail. From tdubois@u-tokyo.ac.jp Tue Dec 26 07:42:47 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!tdubois From: tdubois@u-tokyo.ac.jp (Takeshi Dubois) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec26.074247.6789@u-tokyo.ac.jp> Date: Tue, 26 Dec 1995 07:42:47 GMT References: <1995Dec25.205147.8262@hanse.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Dec25.205147.8262@hanse.de>, areyes@hanse.de (Aiko Reyes) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Takeshi Dubois "A soul is not exclusive to biology." 486DX4/100 (FreeBSD 2.0.5) / NEXTSTEP 3.3 From kwatanabe@pacbell.net Tue Dec 26 18:50:47 1995 Path: ashpoly!cascade!brgate!saturno!pacbell!kwatanabe From: kwatanabe@pacbell.net (Kirsty Watanabe) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec26.185047.7321@pacbell.net> Date: Tue, 26 Dec 1995 18:50:47 GMT References: <1995Dec25.205147.8262@hanse.de> <1995Dec26.074247.6789@u-tokyo.ac.jp> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Dec26.074247.6789@u-tokyo.ac.jp>, tdubois@u-tokyo.ac.jp (Takeshi Dubois) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Kirsty Watanabe *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From hsuzuki@demon.co.uk Wed Dec 27 04:43:47 1995 Path: ashpoly!cascade!brgate!saturno!demon!hsuzuki From: hsuzuki@demon.co.uk (Hugo Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec27.044347.9980@demon.co.uk> Date: Wed, 27 Dec 1995 04:43:47 GMT References: <1995Dec25.205147.8262@hanse.de> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Dec25.205147.8262@hanse.de>, areyes@hanse.de (Aiko Reyes) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Hugo Suzuki Tape trading list upon request. SASE required for international mail.