From fmacdonald@pacbell.net Wed Dec 28 17:44:36 1994 Path: ashpoly!cascade!brgate!saturno!pacbell!fmacdonald From: fmacdonald@pacbell.net (Fiona MacDonald) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec28.174436.7870@pacbell.net> Date: Wed, 28 Dec 1994 17:44:36 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Fiona MacDonald Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------ From nramirez@cam.ac.uk Fri Dec 30 13:05:36 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!nramirez From: nramirez@cam.ac.uk (Natalia Ramírez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec30.130536.6095@cam.ac.uk> Date: Fri, 30 Dec 1994 13:05:36 GMT References: <1994Dec28.174436.7870@pacbell.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Dec28.174436.7870@pacbell.net>, fmacdonald@pacbell.net (Fiona MacDonald) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Natalia Ramírez | nramirez@cam.ac.uk PGP Key fingerprint: CEAC F984 4D2D E995 "Keep the channels open." From lpetrov@delphi.com Fri Dec 30 17:03:36 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!lpetrov From: lpetrov@delphi.com (Lucia Petrov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec30.170336.9840@delphi.com> Date: Fri, 30 Dec 1994 17:03:36 GMT References: <1994Dec28.174436.7870@pacbell.net> <1994Dec30.130536.6095@cam.ac.uk> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Dec30.130536.6095@cam.ac.uk>, nramirez@cam.ac.uk (Natalia Ramírez) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Lucia Petrov Tape trading list upon request. SASE required for international mail. From sandersson@pacbell.net Sat Dec 31 15:36:36 1994 Path: ashpoly!cascade!bigsur!pacbell!sandersson From: sandersson@pacbell.net (Steve Andersson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec31.153636.7704@pacbell.net> Date: Sat, 31 Dec 1994 15:36:36 GMT References: <1994Dec28.174436.7870@pacbell.net> <1994Dec30.130536.6095@cam.ac.uk> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Dec30.130536.6095@cam.ac.uk>, nramirez@cam.ac.uk (Natalia Ramírez) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Steve Andersson Tape trading list upon request. SASE required for international mail. From hschneider@delphi.com Sat Dec 31 18:18:36 1994 Path: ashpoly!cascade!transat!ukc!fennimore!delphi!hschneider From: hschneider@delphi.com (Hana Schneider) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec31.181836.7489@delphi.com> Date: Sat, 31 Dec 1994 18:18:36 GMT References: <1994Dec28.174436.7870@pacbell.net> <1994Dec30.130536.6095@cam.ac.uk> <1994Dec31.153636.7704@pacbell.net> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Dec31.153636.7704@pacbell.net>, sandersson@pacbell.net (Steve Andersson) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Hana Schneider Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------