From mlopez@inria.fr Fri Apr 19 21:12:39 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!inria!mlopez From: mlopez@inria.fr (Morag López) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr19.211239.6438@inria.fr> Date: Fri, 19 Apr 1996 21:12:39 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- === Morag López === Dept of Electrical Engineering, INRIA Rocquencourt "The carrier frequency does not drift by accident." From ysilva@cam.ac.uk Sun Apr 21 19:36:39 1996 Path: ashpoly!cascade!bigsur!cam!ysilva From: ysilva@cam.ac.uk (Yuki Silva) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr21.193639.1471@cam.ac.uk> Date: Sun, 21 Apr 1996 19:36:39 GMT References: <1996Apr19.211239.6438@inria.fr> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1996Apr19.211239.6438@inria.fr>, mlopez@inria.fr (Morag López) 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PGP Public key available via finger or upon request. -- Yuki Silva | ysilva@cam.ac.uk PGP Key fingerprint: D0F1 4913 2598 A37B "Keep the channels open." From boliveira@unam.mx Tue Apr 23 22:19:39 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!boliveira From: boliveira@unam.mx (Bruno Oliveira) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr23.221939.6555@unam.mx> Date: Tue, 23 Apr 1996 22:19:39 GMT References: <1996Apr19.211239.6438@inria.fr> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Apr19.211239.6438@inria.fr>, mlopez@inria.fr (Morag López) 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. -- Bruno Oliveira Tape trading list upon request. SASE required for international mail. From nrodriguez@pacbell.net Wed Apr 24 03:13:39 1996 Path: ashpoly!cascade!bigsur!pacbell!nrodriguez From: nrodriguez@pacbell.net (Natalia Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr24.031339.9291@pacbell.net> Date: Wed, 24 Apr 1996 03:13:39 GMT References: <1996Apr19.211239.6438@inria.fr> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Apr19.211239.6438@inria.fr>, mlopez@inria.fr (Morag López) 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Natalia Rodríguez | nrodriguez@pacbell.net PGP Key fingerprint: 2EF0 20EA EFCB BAE4 "Keep the channels open." From tkarlsson@rwth-aachen.de Wed Apr 24 20:39:39 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!tkarlsson From: tkarlsson@rwth-aachen.de (Tyler Karlsson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr24.203939.8621@rwth-aachen.de> Date: Wed, 24 Apr 1996 20:39:39 GMT References: <1996Apr19.211239.6438@inria.fr> <1996Apr21.193639.1471@cam.ac.uk> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Apr21.193639.1471@cam.ac.uk>, ysilva@cam.ac.uk (Yuki Silva) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! > PGP Public key available via finger or upon request. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Tyler Karlsson *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0