From msantos@rwth-aachen.de Tue Oct 22 19:55:54 1996 Path: ashpoly!cascade!transat!ukc!fennimore!rwth-aachen!msantos From: msantos@rwth-aachen.de (Min-jun Santos) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct22.195554.9794@rwth-aachen.de> Date: Tue, 22 Oct 1996 19:55:54 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Min-jun Santos Opinions expressed are solely my own and not those of RWTH Aachen Informatik. ------------------------------------------------------------ From lnovak@purdue.edu Wed Oct 23 04:52:54 1996 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!lnovak From: lnovak@purdue.edu (Liam Novak) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct23.045254.9248@purdue.edu> Date: Wed, 23 Oct 1996 04:52:54 GMT References: <1996Oct22.195554.9794@rwth-aachen.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Oct22.195554.9794@rwth-aachen.de>, msantos@rwth-aachen.de (Min-jun Santos) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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. -- === Liam Novak === Dept of Electrical Engineering, Purdue University Engineering Computer Network "Marcus is not one man." From dlopez@pipeline.com Wed Oct 23 07:17:54 1996 Path: ashpoly!cascade!bigsur!pipeline!dlopez From: dlopez@pipeline.com (Diego López) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct23.071754.5674@pipeline.com> Date: Wed, 23 Oct 1996 07:17:54 GMT References: <1996Oct22.195554.9794@rwth-aachen.de> <1996Oct23.045254.9248@purdue.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Oct23.045254.9248@purdue.edu>, lnovak@purdue.edu (Liam Novak) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Diego López Practical Peripherals 14.4 @ 19,200 bps "They will send a copy in my place." From crobertson@netcom.com Wed Oct 23 13:11:54 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!netcom!crobertson From: crobertson@netcom.com (Camila Robertson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct23.131154.5113@netcom.com> Date: Wed, 23 Oct 1996 13:11:54 GMT References: <1996Oct22.195554.9794@rwth-aachen.de> <1996Oct23.045254.9248@purdue.edu> <1996Oct23.071754.5674@pipeline.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Oct23.071754.5674@pipeline.com>, dlopez@pipeline.com (Diego López) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Camila Robertson Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services. ------------------------------------------------------------ From mreyes@clari.net Fri Oct 25 05:53:54 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!mreyes From: mreyes@clari.net (Mathieu Reyes) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct25.055354.3970@clari.net> Date: Fri, 25 Oct 1996 05:53:54 GMT References: <1996Oct22.195554.9794@rwth-aachen.de> <1996Oct23.045254.9248@purdue.edu> <1996Oct23.071754.5674@pipeline.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Oct23.071754.5674@pipeline.com>, dlopez@pipeline.com (Diego López) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Mathieu Reyes -- ClariNet Communications Corp "The carrier frequency does not drift by accident."