From okang@pacbell.net Wed Feb 01 14:46:28 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!okang From: okang@pacbell.net (Olga Kang) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb01.144628.6292@pacbell.net> Date: Wed, 01 Feb 1995 14:46:28 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] 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! -- Olga Kang US Robotics Courier V.34 @ 28,800 bps "Marcus is not one man." From tfischer@pacbell.net Fri Feb 03 16:55:28 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!tfischer From: tfischer@pacbell.net (Tyler Fischer) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb03.165528.3235@pacbell.net> Date: Fri, 03 Feb 1995 16:55:28 GMT References: <1995Feb01.144628.6292@pacbell.net> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb01.144628.6292@pacbell.net>, okang@pacbell.net (Olga Kang) writes: > 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! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- === Tyler Fischer === Dept of Electrical Engineering, Pacific Bell Internet Services "Hold for relay." From mmartinez@inria.fr Sat Feb 04 17:20:28 1995 Path: ashpoly!cascade!brgate!saturno!inria!mmartinez From: mmartinez@inria.fr (Mateo Martínez) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb04.172028.8678@inria.fr> Date: Sat, 04 Feb 1995 17:20:28 GMT References: <1995Feb01.144628.6292@pacbell.net> <1995Feb03.165528.3235@pacbell.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Feb03.165528.3235@pacbell.net>, tfischer@pacbell.net (Tyler Fischer) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Mateo Martínez *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0