From mmartinez@tum.de Mon Jul 25 08:28:16 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!mmartinez From: mmartinez@tum.de (Mikhail Martínez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul25.082816.8432@tum.de> Date: Mon, 25 Jul 1994 08:28:16 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Mikhail Martínez *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From nrobertson@earthlink.net Tue Jul 26 03:56:16 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!nrobertson From: nrobertson@earthlink.net (Nadia Robertson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul26.035616.3418@earthlink.net> Date: Tue, 26 Jul 1994 03:56:16 GMT References: <1994Jul25.082816.8432@tum.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Jul25.082816.8432@tum.de>, mmartinez@tum.de (Mikhail Martínez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. PGP Public key available via finger or upon request. -- === Nadia Robertson === Dept of Electrical Engineering, EarthLink Network "The carrier frequency does not drift by accident." From hmacdonald@earthlink.net Tue Jul 26 18:33:16 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!hmacdonald From: hmacdonald@earthlink.net (Hana MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul26.183316.7359@earthlink.net> Date: Tue, 26 Jul 1994 18:33:16 GMT References: <1994Jul25.082816.8432@tum.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jul25.082816.8432@tum.de>, mmartinez@tum.de (Mikhail Martínez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Hana MacDonald Hayes Optima 288 @ 9600 Telebit bps "Row 14. No joke." From agonzalez@stanford.edu Wed Jul 27 06:03:16 1994 Path: ashpoly!cascade!mxgate!coyoacan!stanford!agonzalez From: agonzalez@stanford.edu (Anja González) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul27.060316.5014@stanford.edu> Date: Wed, 27 Jul 1994 06:03:16 GMT References: <1994Jul25.082816.8432@tum.de> <1994Jul26.183316.7359@earthlink.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Jul26.183316.7359@earthlink.net>, hmacdonald@earthlink.net (Hana MacDonald) 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Anja González Tape trading list upon request. SASE required for international mail.