From dfournier@pipeline.com Thu Jul 14 23:59:59 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!dfournier From: dfournier@pipeline.com (Dong-hyun Fournier) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul14.235959.5519@pipeline.com> Date: Thu, 14 Jul 1994 23:59:59 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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! -- Dong-hyun Fournier | dfournier@pipeline.com PGP Key fingerprint: 9ADD 0632 3394 1DE2 "Keep the channels open." From bgarcia@purdue.edu Sat Jul 16 20:47:59 1994 Path: ashpoly!cascade!mxgate!coyoacan!purdue!bgarcia From: bgarcia@purdue.edu (Brian García) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul16.204759.7283@purdue.edu> Date: Sat, 16 Jul 1994 20:47:59 GMT References: <1994Jul14.235959.5519@pipeline.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Jul14.235959.5519@pipeline.com>, dfournier@pipeline.com (Dong-hyun Fournier) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Brian García -- Purdue University Engineering Computer Network "The carrier frequency does not drift by accident." From rgirard@inria.fr Mon Jul 18 21:37:59 1994 Path: ashpoly!cascade!mxgate!coyoacan!inria!rgirard From: rgirard@inria.fr (Renata Girard) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jul18.213759.2238@inria.fr> Date: Mon, 18 Jul 1994 21:37:59 GMT References: <1994Jul14.235959.5519@pipeline.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Jul14.235959.5519@pipeline.com>, dfournier@pipeline.com (Dong-hyun Fournier) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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! -- Renata Girard Practical Peripherals 14.4 @ 9600 Telebit bps "A soul is not exclusive to biology."