From aramirez@mit.edu Tue Oct 22 14:06:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!aramirez From: aramirez@mit.edu (Amy Ramírez) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct22.140655.2377@mit.edu> Date: Tue, 22 Oct 1996 14:06:55 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Amy Ramírez Hayes Optima 288 @ 14,400 bps "Tape doesn't lie at 02:14. Ears do." From dtanaka@inria.fr Wed Oct 23 15:05:55 1996 Path: ashpoly!cascade!transat!ukc!fennimore!inria!dtanaka From: dtanaka@inria.fr (Diego Tanaka) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct23.150555.7143@inria.fr> Date: Wed, 23 Oct 1996 15:05:55 GMT References: <1996Oct22.140655.2377@mit.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Oct22.140655.2377@mit.edu>, aramirez@mit.edu (Amy Ramírez) 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. -- Diego Tanaka | dtanaka@inria.fr PGP Key fingerprint: 68F6 DA2B 905B 43C9 "Keep the channels open."