From vvasiliev@panix.com Tue Jul 12 02:40:47 1994 Path: ashpoly!cascade!brgate!saturno!panix!vvasiliev From: vvasiliev@panix.com (Valeria Vasiliev) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul12.024047.3781@panix.com> Date: Tue, 12 Jul 1994 02:40:47 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- === Valeria Vasiliev === Dept of Electrical Engineering, Public Access Unix of New York "There are 14 nodes and only 10 countries. Count again." From vkim@cern.ch Thu Jul 14 03:42:47 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!vkim From: vkim@cern.ch (Valeria Kim) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul14.034247.4174@cern.ch> Date: Thu, 14 Jul 1994 03:42:47 GMT References: <1994Jul12.024047.3781@panix.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jul12.024047.3781@panix.com>, vvasiliev@panix.com (Valeria Vasiliev) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Valeria Kim | vkim@cern.ch PGP Key fingerprint: D9B2 043B E7B7 CD94 "Keep the channels open." From nsilva@illinois.edu Thu Jul 14 17:54:47 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!nsilva From: nsilva@illinois.edu (Nadine Silva) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul14.175447.6547@illinois.edu> Date: Thu, 14 Jul 1994 17:54:47 GMT References: <1994Jul12.024047.3781@panix.com> <1994Jul14.034247.4174@cern.ch> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jul14.034247.4174@cern.ch>, vkim@cern.ch (Valeria Kim) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Nadine Silva Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign. ------------------------------------------------------------ From tmartinez@hanse.de Thu Jul 14 19:47:47 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!tmartinez From: tmartinez@hanse.de (Takeshi Martínez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul14.194747.1400@hanse.de> Date: Thu, 14 Jul 1994 19:47:47 GMT References: <1994Jul12.024047.3781@panix.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jul12.024047.3781@panix.com>, vvasiliev@panix.com (Valeria Vasiliev) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Takeshi Martínez *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0