From areyes@pacbell.net Fri Oct 27 06:00:32 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!areyes From: areyes@pacbell.net (Anja Reyes) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct27.060032.3699@pacbell.net> Date: Fri, 27 Oct 1995 06:00:32 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. 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! -- Anja Reyes Hayes Optima 288 @ 14,400 bps "Hardware is temporary. The signal survives." From eramirez@panix.com Sat Oct 28 07:52:32 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!eramirez From: eramirez@panix.com (Élodie Ramírez) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Oct28.075232.7033@panix.com> Date: Sat, 28 Oct 1995 07:52:32 GMT References: <1995Oct27.060032.3699@pacbell.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Oct27.060032.3699@pacbell.net>, areyes@pacbell.net (Anja Reyes) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Élodie Ramírez Tape trading list upon request. SASE required for international mail.