From sivanov@netcom.com Sat Feb 24 09:16:26 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!sivanov From: sivanov@netcom.com (Sun-mi Ivanov) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb24.091626.3295@netcom.com> Date: Sat, 24 Feb 1996 09:16:26 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- === Sun-mi Ivanov === Dept of Electrical Engineering, NETCOM On-Line Communication Services "A soul is not exclusive to biology." From fdubois@illinois.edu Sat Feb 24 15:27:26 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!fdubois From: fdubois@illinois.edu (Fiona Dubois) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb24.152726.8873@illinois.edu> Date: Sat, 24 Feb 1996 15:27:26 GMT References: <1996Feb24.091626.3295@netcom.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1996Feb24.091626.3295@netcom.com>, sivanov@netcom.com (Sun-mi Ivanov) 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Fiona Dubois *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From gsmirnov@mit.edu Mon Feb 26 08:25:26 1996 Path: ashpoly!cascade!bigsur!mit!gsmirnov From: gsmirnov@mit.edu (Göran Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb26.082526.5730@mit.edu> Date: Mon, 26 Feb 1996 08:25:26 GMT References: <1996Feb24.091626.3295@netcom.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Feb24.091626.3295@netcom.com>, sivanov@netcom.com (Sun-mi Ivanov) 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Göran Smirnov Tape trading list upon request. SASE required for international mail. From hduarte@clari.net Tue Feb 27 08:33:26 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!hduarte From: hduarte@clari.net (Hugo Duarte) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb27.083326.7179@clari.net> Date: Tue, 27 Feb 1996 08:33:26 GMT References: <1996Feb24.091626.3295@netcom.com> <1996Feb26.082526.5730@mit.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Feb26.082526.5730@mit.edu>, gsmirnov@mit.edu (Göran Smirnov) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Hugo Duarte Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From fandersson@pacbell.net Tue Feb 27 19:55:26 1996 Path: ashpoly!cascade!mxgate!coyoacan!pacbell!fandersson From: fandersson@pacbell.net (Freya Andersson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Feb27.195526.1876@pacbell.net> Date: Tue, 27 Feb 1996 19:55:26 GMT References: <1996Feb24.091626.3295@netcom.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Feb24.091626.3295@netcom.com>, sivanov@netcom.com (Sun-mi Ivanov) 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Freya Andersson Tape trading list upon request. SASE required for international mail.