From lkim@mindspring.com Fri Feb 10 03:23:29 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mindspring!lkim From: lkim@mindspring.com (Lisa Kim) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb10.032329.7095@mindspring.com> Date: Fri, 10 Feb 1995 03:23:29 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com 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. -- Lisa Kim *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From rhernandez@hanse.de Sat Feb 11 18:59:29 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!rhernandez From: rhernandez@hanse.de (Renata Hernández) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb11.185929.3308@hanse.de> Date: Sat, 11 Feb 1995 18:59:29 GMT References: <1995Feb10.032329.7095@mindspring.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb10.032329.7095@mindspring.com>, lkim@mindspring.com (Lisa Kim) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Renata Hernández *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From mmoreau@berkeley.edu Mon Feb 13 00:26:29 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!mmoreau From: mmoreau@berkeley.edu (Min-jun Moreau) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb13.002629.9818@berkeley.edu> Date: Mon, 13 Feb 1995 00:26:29 GMT References: <1995Feb10.032329.7095@mindspring.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Feb10.032329.7095@mindspring.com>, lkim@mindspring.com (Lisa Kim) 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! -- Min-jun Moreau "Measuring a record you own is listening, not piracy." 486DX2/66 (Linux 1.2.13) / System 7.5.1