From dnovak@earthlink.net Thu Sep 05 13:50:37 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!dnovak From: dnovak@earthlink.net (Diego Novak) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep05.135037.1150@earthlink.net> Date: Thu, 05 Sep 1996 13:50:37 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Diego Novak | dnovak@earthlink.net PGP Key fingerprint: 85C1 70A0 4C63 98E9 "Keep the channels open." From dhernandez@utexas.edu Thu Sep 05 19:16:37 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!dhernandez From: dhernandez@utexas.edu (Diego Hernández) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep05.191637.5690@utexas.edu> Date: Thu, 05 Sep 1996 19:16:37 GMT References: <1996Sep05.135037.1150@earthlink.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Sep05.135037.1150@earthlink.net>, dnovak@earthlink.net (Diego Novak) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Diego Hernández "Extraordinary claims require extraordinary spectra." Pentium 90 (OS/2 Warp) / FreeBSD 2.1 From mhernandez@kth.se Fri Sep 06 12:13:37 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!mhernandez From: mhernandez@kth.se (Min-jun Hernández) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep06.121337.7797@kth.se> Date: Fri, 06 Sep 1996 12:13:37 GMT References: <1996Sep05.135037.1150@earthlink.net> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Sep05.135037.1150@earthlink.net>, dnovak@earthlink.net (Diego Novak) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Min-jun Hernández "Hold for relay." PC-9821Ap2 (NEC) / AmigaOS 3.1 From cmuller@netcom.com Sat Sep 07 08:52:37 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!cmuller From: cmuller@netcom.com (Camila Müller) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep07.085237.3271@netcom.com> Date: Sat, 07 Sep 1996 08:52:37 GMT References: <1996Sep05.135037.1150@earthlink.net> <1996Sep06.121337.7797@kth.se> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 12 In article <1996Sep06.121337.7797@kth.se>, mhernandez@kth.se (Min-jun Hernández) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. > Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? If you are posting from AOL, please read RFC 1036 before posting again. -- === Camila Müller === Dept of Electrical Engineering, NETCOM On-Line Communication Services "Extraordinary claims require extraordinary spectra."