From msantos@pacbell.net Fri Mar 15 06:24:44 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!msantos From: msantos@pacbell.net (Marisol Santos) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar15.062444.1167@pacbell.net> Date: Fri, 15 Mar 1996 06:24:44 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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! -- Marisol Santos -- Pacific Bell Internet Services "When every node is whole, the channel opens." From mgarcia@panix.com Fri Mar 15 20:05:44 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!mgarcia From: mgarcia@panix.com (Mateo García) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar15.200544.5284@panix.com> Date: Fri, 15 Mar 1996 20:05:44 GMT References: <1996Mar15.062444.1167@pacbell.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Mar15.062444.1167@pacbell.net>, msantos@pacbell.net (Marisol Santos) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Mateo García Zyxel U-1496E @ 9600 Telebit bps "We don't sign stars. We build them." From jlaurent@kth.se Sat Mar 16 18:07:44 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!jlaurent From: jlaurent@kth.se (Julien Laurent) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Mar16.180744.8771@kth.se> Date: Sat, 16 Mar 1996 18:07:44 GMT References: <1996Mar15.062444.1167@pacbell.net> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Mar15.062444.1167@pacbell.net>, msantos@pacbell.net (Marisol Santos) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Julien Laurent *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0