From mweber@uu.net Tue Dec 12 18:41:59 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!mweber From: mweber@uu.net (Mei Weber) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec12.184159.8415@uu.net> Date: Tue, 12 Dec 1995 18:41:59 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Mei Weber *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From mnilsson@hanse.de Thu Dec 14 01:46:59 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!hanse!mnilsson From: mnilsson@hanse.de (Mei Nilsson) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec14.014659.1727@hanse.de> Date: Thu, 14 Dec 1995 01:46:59 GMT References: <1995Dec12.184159.8415@uu.net> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Dec12.184159.8415@uu.net>, mweber@uu.net (Mei Weber) 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Mei Nilsson "They will send a copy in my place." 486DX2/66 (Linux 1.2.13) / NEXTSTEP 3.3 From mtakahashi@mindspring.com Fri Dec 15 16:09:59 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!mtakahashi From: mtakahashi@mindspring.com (Marta Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec15.160959.7326@mindspring.com> Date: Fri, 15 Dec 1995 16:09:59 GMT References: <1995Dec12.184159.8415@uu.net> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Dec12.184159.8415@uu.net>, mweber@uu.net (Mei Weber) 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! -- Marta Takahashi -- MindSpring Enterprises "Hold for relay." From landersson@pipeline.com Sat Dec 16 22:28:59 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!landersson From: landersson@pipeline.com (Lars Andersson) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec16.222859.8636@pipeline.com> Date: Sat, 16 Dec 1995 22:28:59 GMT References: <1995Dec12.184159.8415@uu.net> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Dec12.184159.8415@uu.net>, mweber@uu.net (Mei Weber) 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Lars Andersson -- The Pipeline Internet Network "When every node is whole, the channel opens."