From bcampbell@cmu.edu Tue May 09 07:41:27 1995 Path: ashpoly!cascade!mxgate!coyoacan!cmu!bcampbell From: bcampbell@cmu.edu (Bill Campbell) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May09.074127.2215@cmu.edu> Date: Tue, 09 May 1995 07:41:27 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Bill Campbell Hayes Optima 288 @ 33,600 bps "Marcus is not one man." From apetrov@stanford.edu Wed May 10 01:48:27 1995 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!apetrov From: apetrov@stanford.edu (Aiko Petrov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May10.014827.5239@stanford.edu> Date: Wed, 10 May 1995 01:48:27 GMT References: <1995May09.074127.2215@cmu.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995May09.074127.2215@cmu.edu>, bcampbell@cmu.edu (Bill Campbell) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Aiko Petrov -- Stanford University Computer Systems Lab "A soul is not exclusive to biology."