From vsuzuki@delphi.com Mon Feb 26 10:55:20 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!delphi!vsuzuki From: vsuzuki@delphi.com (Valeria Suzuki) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb26.105520.1321@delphi.com> Date: Mon, 26 Feb 1996 10:55:20 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- === Valeria Suzuki === Dept of Electrical Engineering, Delphi Internet Services "The carrier frequency does not drift by accident." From dtanaka@mindspring.com Wed Feb 28 10:58:20 1996 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!dtanaka From: dtanaka@mindspring.com (Diego Tanaka) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb28.105820.3989@mindspring.com> Date: Wed, 28 Feb 1996 10:58:20 GMT References: <1996Feb26.105520.1321@delphi.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Feb26.105520.1321@delphi.com>, vsuzuki@delphi.com (Valeria Suzuki) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Diego Tanaka "Tape doesn't lie at 02:14. Ears do." Amiga 1200 (Blizzard 030/50) / AmigaOS 3.1 From msouza@stanford.edu Fri Mar 01 02:07:20 1996 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!msouza From: msouza@stanford.edu (Matthias Souza) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar01.020720.1469@stanford.edu> Date: Fri, 01 Mar 1996 02:07:20 GMT References: <1996Feb26.105520.1321@delphi.com> <1996Feb28.105820.3989@mindspring.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Feb28.105820.3989@mindspring.com>, dtanaka@mindspring.com (Diego Tanaka) writes: > 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 make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Matthias Souza Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab. ------------------------------------------------------------ From rwatanabe@mindspring.com Sat Mar 02 00:53:20 1996 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!rwatanabe From: rwatanabe@mindspring.com (Raj Watanabe) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar02.005320.6173@mindspring.com> Date: Sat, 02 Mar 1996 00:53:20 GMT References: <1996Feb26.105520.1321@delphi.com> <1996Feb28.105820.3989@mindspring.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Feb28.105820.3989@mindspring.com>, dtanaka@mindspring.com (Diego Tanaka) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Raj Watanabe -- MindSpring Enterprises "The hatch is open. Is anyone listening?"