From rdubois@pipeline.com Mon Jan 22 11:33:18 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!rdubois From: rdubois@pipeline.com (Raj Dubois) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan22.113318.5377@pipeline.com> Date: Mon, 22 Jan 1996 11:33:18 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 10 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! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Raj Dubois -- The Pipeline Internet Network "The hatch is open. Is anyone listening?" From hfischer@uu.net Mon Jan 22 12:44:18 1996 Path: ashpoly!cascade!brgate!saturno!uu!hfischer From: hfischer@uu.net (Hana Fischer) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan22.124418.8148@uu.net> Date: Mon, 22 Jan 1996 12:44:18 GMT References: <1996Jan22.113318.5377@pipeline.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jan22.113318.5377@pipeline.com>, rdubois@pipeline.com (Raj Dubois) 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. -- Hana Fischer -- UUNET Technologies, Falls Church VA "A soul is not exclusive to biology." From msmirnov@clari.net Mon Jan 22 15:27:18 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!msmirnov From: msmirnov@clari.net (Mateo Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan22.152718.3369@clari.net> Date: Mon, 22 Jan 1996 15:27:18 GMT References: <1996Jan22.113318.5377@pipeline.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jan22.113318.5377@pipeline.com>, rdubois@pipeline.com (Raj Dubois) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Mateo Smirnov *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0