From lmoreau@netcom.com Mon Oct 16 16:21:51 1995 Path: ashpoly!cascade!mxgate!coyoacan!netcom!lmoreau From: lmoreau@netcom.com (Lars Moreau) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct16.162151.9791@netcom.com> Date: Mon, 16 Oct 1995 16:21:51 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 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? -- Lars Moreau Zyxel U-1496E @ 33,600 bps "Do not worship the copy." From khernandez@uni-hamburg.de Tue Oct 17 04:03:51 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!khernandez From: khernandez@uni-hamburg.de (Kenji Hernández) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct17.040351.2824@uni-hamburg.de> Date: Tue, 17 Oct 1995 04:03:51 GMT References: <1995Oct16.162151.9791@netcom.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct16.162151.9791@netcom.com>, lmoreau@netcom.com (Lars Moreau) writes: > 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! Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Kenji Hernández Tape trading list upon request. SASE required for international mail. From etanaka@utexas.edu Tue Oct 17 19:14:51 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!etanaka From: etanaka@utexas.edu (Élodie Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct17.191451.7328@utexas.edu> Date: Tue, 17 Oct 1995 19:14:51 GMT References: <1995Oct16.162151.9791@netcom.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Oct16.162151.9791@netcom.com>, lmoreau@netcom.com (Lars Moreau) writes: > 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! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Élodie Tanaka | etanaka@utexas.edu PGP Key fingerprint: 20FC F15F 8B22 F650 "Keep the channels open." From akarlsson@mindspring.com Wed Oct 18 14:07:51 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!akarlsson From: akarlsson@mindspring.com (Astrid Karlsson) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct18.140751.3346@mindspring.com> Date: Wed, 18 Oct 1995 14:07:51 GMT References: <1995Oct16.162151.9791@netcom.com> <1995Oct17.191451.7328@utexas.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Oct17.191451.7328@utexas.edu>, etanaka@utexas.edu (Élodie Tanaka) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Astrid Karlsson === Dept of Electrical Engineering, MindSpring Enterprises "They will send a copy in my place." From mpetrov@titech.ac.jp Fri Oct 20 11:25:51 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!mpetrov From: mpetrov@titech.ac.jp (Marisol Petrov) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct20.112551.1057@titech.ac.jp> Date: Fri, 20 Oct 1995 11:25:51 GMT References: <1995Oct16.162151.9791@netcom.com> <1995Oct17.191451.7328@utexas.edu> <1995Oct18.140751.3346@mindspring.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Oct18.140751.3346@mindspring.com>, akarlsson@mindspring.com (Astrid Karlsson) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Marisol Petrov Practical Peripherals 14.4 @ 9600 Telebit bps "When every node is whole, the channel opens."