From nduarte@kth.se Fri Apr 07 04:00:42 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!nduarte From: nduarte@kth.se (Natalia Duarte) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr07.040042.1352@kth.se> Date: Fri, 07 Apr 1995 04:00:42 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Natalia Duarte | nduarte@kth.se PGP Key fingerprint: 433E 07F7 8EF5 7348 "Keep the channels open." From hlee@pipeline.com Fri Apr 07 11:21:42 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!hlee From: hlee@pipeline.com (Hugo Lee) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr07.112142.8706@pipeline.com> Date: Fri, 07 Apr 1995 11:21:42 GMT References: <1995Apr07.040042.1352@kth.se> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Apr07.040042.1352@kth.se>, nduarte@kth.se (Natalia Duarte) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Hugo Lee Hayes Optima 288 @ 28,800 bps "The hatch is open. Is anyone listening?" From krodriguez@illinois.edu Fri Apr 07 22:21:42 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!illinois!krodriguez From: krodriguez@illinois.edu (Kenji Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr07.222142.3071@illinois.edu> Date: Fri, 07 Apr 1995 22:21:42 GMT References: <1995Apr07.040042.1352@kth.se> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Apr07.040042.1352@kth.se>, nduarte@kth.se (Natalia Duarte) 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Kenji Rodríguez "When every node is whole, the channel opens." Macintosh IIfx / FreeBSD 2.1 From tsilva@uni-hamburg.de Sun Apr 09 23:43:42 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!tsilva From: tsilva@uni-hamburg.de (Tyler Silva) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr09.234342.3649@uni-hamburg.de> Date: Sun, 09 Apr 1995 23:43:42 GMT References: <1995Apr07.040042.1352@kth.se> <1995Apr07.222142.3071@illinois.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr07.222142.3071@illinois.edu>, krodriguez@illinois.edu (Kenji Rodríguez) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Tyler Silva Hayes Optima 288 @ 9600 Telebit bps "There are 14 nodes and only 10 countries. Count again."