From mkarlsson@earthlink.net Tue Sep 24 13:23:08 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!mkarlsson From: mkarlsson@earthlink.net (Marta Karlsson) Newsgroups: comp.sys.m68k Subject: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep24.132308.8052@earthlink.net> Date: Tue, 24 Sep 1996 13:23:08 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Marta Karlsson SupraFAXModem 28.8 @ 9600 Telebit bps "We don't sign stars. We build them." From trobertson@rwth-aachen.de Wed Sep 25 02:59:08 1996 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!trobertson From: trobertson@rwth-aachen.de (Tyler Robertson) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep25.025908.5694@rwth-aachen.de> Date: Wed, 25 Sep 1996 02:59:08 GMT References: <1996Sep24.132308.8052@earthlink.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Sep24.132308.8052@earthlink.net>, mkarlsson@earthlink.net (Marta Karlsson) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Tyler Robertson Tape trading list upon request. SASE required for international mail. From astewart@hanse.de Thu Sep 26 22:02:08 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!astewart From: astewart@hanse.de (Aiko Stewart) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep26.220208.6928@hanse.de> Date: Thu, 26 Sep 1996 22:02:08 GMT References: <1996Sep24.132308.8052@earthlink.net> <1996Sep25.025908.5694@rwth-aachen.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Sep25.025908.5694@rwth-aachen.de>, trobertson@rwth-aachen.de (Tyler Robertson) 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! -- Aiko Stewart Practical Peripherals 14.4 @ 33,600 bps "A soul is not exclusive to biology." From alopez@rwth-aachen.de Fri Sep 27 12:26:08 1996 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!alopez From: alopez@rwth-aachen.de (Andrei López) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep27.122608.7144@rwth-aachen.de> Date: Fri, 27 Sep 1996 12:26:08 GMT References: <1996Sep24.132308.8052@earthlink.net> <1996Sep25.025908.5694@rwth-aachen.de> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Sep25.025908.5694@rwth-aachen.de>, trobertson@rwth-aachen.de (Tyler Robertson) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Andrei López Tape trading list upon request. SASE required for international mail. From ahughes@berkeley.edu Fri Sep 27 22:25:08 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!ahughes From: ahughes@berkeley.edu (Anton Hughes) Newsgroups: comp.sys.m68k Subject: Re: Observation: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep27.222508.3443@berkeley.edu> Date: Fri, 27 Sep 1996 22:25:08 GMT References: <1996Sep24.132308.8052@earthlink.net> <1996Sep25.025908.5694@rwth-aachen.de> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Sep25.025908.5694@rwth-aachen.de>, trobertson@rwth-aachen.de (Tyler Robertson) 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. -- Anton Hughes Zyxel U-1496E @ 14,400 bps "Hardware is temporary. The signal survives."