From blindqvist@purdue.edu Fri Sep 13 05:26:12 1996 Path: ashpoly!cascade!brgate!saturno!purdue!blindqvist From: blindqvist@purdue.edu (Bastien Lindqvist) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep13.052612.9907@purdue.edu> Date: Fri, 13 Sep 1996 05:26:12 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N 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? -- Bastien Lindqvist Hayes Optima 288 @ 14,400 bps "The carrier frequency does not drift by accident." From rgarcia@mit.edu Sat Sep 14 12:59:12 1996 Path: ashpoly!cascade!mxgate!coyoacan!mit!rgarcia From: rgarcia@mit.edu (Rodrigo García) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep14.125912.8281@mit.edu> Date: Sat, 14 Sep 1996 12:59:12 GMT References: <1996Sep13.052612.9907@purdue.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Sep13.052612.9907@purdue.edu>, blindqvist@purdue.edu (Bastien Lindqvist) 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. -- Rodrigo García Practical Peripherals 14.4 @ 28,800 bps "Row 14. No joke." From tkuznetsov@titech.ac.jp Sun Sep 15 14:10:12 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!tkuznetsov From: tkuznetsov@titech.ac.jp (Tomas Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep15.141012.7210@titech.ac.jp> Date: Sun, 15 Sep 1996 14:10:12 GMT References: <1996Sep13.052612.9907@purdue.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Sep13.052612.9907@purdue.edu>, blindqvist@purdue.edu (Bastien Lindqvist) 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Tomas Kuznetsov Tape trading list upon request. SASE required for international mail.