From mhernandez@titech.ac.jp Thu May 23 14:15:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!mhernandez From: mhernandez@titech.ac.jp (Mei Hernández) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996May23.141555.8344@titech.ac.jp> Date: Thu, 23 May 1996 14:15:55 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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? -- Mei Hernández Tape trading list upon request. SASE required for international mail. From kperez@mit.edu Sat May 25 11:21:55 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!kperez From: kperez@mit.edu (Katrin Pérez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996May25.112155.3024@mit.edu> Date: Sat, 25 May 1996 11:21:55 GMT References: <1996May23.141555.8344@titech.ac.jp> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996May23.141555.8344@titech.ac.jp>, mhernandez@titech.ac.jp (Mei Hernández) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Katrin Pérez "Extraordinary claims require extraordinary spectra." Commodore Amiga 500 (1MB OCS) / System 7.5.1