From anakamura@utexas.edu Thu Sep 28 10:58:21 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!anakamura From: anakamura@utexas.edu (Amy Nakamura) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep28.105821.8540@utexas.edu> Date: Thu, 28 Sep 1995 10:58:21 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Amy Nakamura *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From achoi@u-tokyo.ac.jp Sat Sep 30 05:49:21 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!achoi From: achoi@u-tokyo.ac.jp (Aiko Choi) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep30.054921.8901@u-tokyo.ac.jp> Date: Sat, 30 Sep 1995 05:49:21 GMT References: <1995Sep28.105821.8540@utexas.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Sep28.105821.8540@utexas.edu>, anakamura@utexas.edu (Amy Nakamura) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- === Aiko Choi === Dept of Electrical Engineering, University of Tokyo Department of Information Science "Row 14. No joke." From bstewart@clari.net Sat Sep 30 14:41:21 1995 Path: ashpoly!cascade!mxgate!coyoacan!clari!bstewart From: bstewart@clari.net (Brian Stewart) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep30.144121.7657@clari.net> Date: Sat, 30 Sep 1995 14:41:21 GMT References: <1995Sep28.105821.8540@utexas.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep28.105821.8540@utexas.edu>, anakamura@utexas.edu (Amy Nakamura) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Brian Stewart "When every node is whole, the channel opens." Amiga 3000T / NEXTSTEP 3.3 From geriksson@unam.mx Sun Oct 01 12:38:21 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!geriksson From: geriksson@unam.mx (Graham Eriksson) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct01.123821.4282@unam.mx> Date: Sun, 01 Oct 1995 12:38:21 GMT References: <1995Sep28.105821.8540@utexas.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Sep28.105821.8540@utexas.edu>, anakamura@utexas.edu (Amy Nakamura) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- === Graham Eriksson === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "Row 14. No joke."