From olee@clari.net Sat Apr 01 02:25:23 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!olee From: olee@clari.net (Olga Lee) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr01.022523.5206@clari.net> Date: Sat, 01 Apr 1995 02:25:23 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. 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? -- Olga Lee *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From msanchez@berkeley.edu Sat Apr 01 06:51:23 1995 Path: ashpoly!cascade!brgate!saturno!berkeley!msanchez From: msanchez@berkeley.edu (Mateo Sánchez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr01.065123.4477@berkeley.edu> Date: Sat, 01 Apr 1995 06:51:23 GMT References: <1995Apr01.022523.5206@clari.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr01.022523.5206@clari.net>, olee@clari.net (Olga Lee) 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! -- Mateo Sánchez Tape trading list upon request. SASE required for international mail. From etanaka@utexas.edu Sat Apr 01 23:11:23 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!etanaka From: etanaka@utexas.edu (Elaine Tanaka) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr01.231123.8297@utexas.edu> Date: Sat, 01 Apr 1995 23:11:23 GMT References: <1995Apr01.022523.5206@clari.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Apr01.022523.5206@clari.net>, olee@clari.net (Olga Lee) 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! Top-posters will be placed in my ~/.killfile without notice. -- Elaine Tanaka US Robotics Courier V.34 @ 9600 Telebit bps "5 sigma is a discovery. 7 is a question." From lrodriguez@cern.ch Mon Apr 03 08:10:23 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!lrodriguez From: lrodriguez@cern.ch (Lars Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr03.081023.5773@cern.ch> Date: Mon, 03 Apr 1995 08:10:23 GMT References: <1995Apr01.022523.5206@clari.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr01.022523.5206@clari.net>, olee@clari.net (Olga Lee) 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. -- Lars Rodríguez | lrodriguez@cern.ch PGP Key fingerprint: 9DA0 A9C7 5592 4C34 "Keep the channels open." From astewart@pacbell.net Tue Apr 04 16:32:23 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!astewart From: astewart@pacbell.net (Anton Stewart) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr04.163223.6647@pacbell.net> Date: Tue, 04 Apr 1995 16:32:23 GMT References: <1995Apr01.022523.5206@clari.net> <1995Apr03.081023.5773@cern.ch> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Apr03.081023.5773@cern.ch>, lrodriguez@cern.ch (Lars Rodríguez) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Anton Stewart | astewart@pacbell.net PGP Key fingerprint: EAEE CD84 9B95 E7AC "Keep the channels open."