From tvasiliev@berkeley.edu Thu Dec 22 11:01:23 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!tvasiliev From: tvasiliev@berkeley.edu (Tobias Vasiliev) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec22.110123.4596@berkeley.edu> Date: Thu, 22 Dec 1994 11:01:23 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 11 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! Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- === Tobias Vasiliev === Dept of Electrical Engineering, UC Berkeley Department of EECS "Hold for relay." From ssmirnov@pipeline.com Fri Dec 23 07:54:23 1994 Path: ashpoly!cascade!brgate!saturno!pipeline!ssmirnov From: ssmirnov@pipeline.com (Sun-mi Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec23.075423.6572@pipeline.com> Date: Fri, 23 Dec 1994 07:54:23 GMT References: <1994Dec22.110123.4596@berkeley.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Dec22.110123.4596@berkeley.edu>, tvasiliev@berkeley.edu (Tobias Vasiliev) writes: > 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Sun-mi Smirnov Tape trading list upon request. SASE required for international mail. From osouza@kth.se Sun Dec 25 06:17:23 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kth!osouza From: osouza@kth.se (Olga Souza) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec25.061723.8130@kth.se> Date: Sun, 25 Dec 1994 06:17:23 GMT References: <1994Dec22.110123.4596@berkeley.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Dec22.110123.4596@berkeley.edu>, tvasiliev@berkeley.edu (Tobias Vasiliev) writes: > 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. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. PGP Public key available via finger or upon request. -- Olga Souza Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------ From jito@kiae.su Mon Dec 26 07:55:23 1994 Path: ashpoly!cascade!bigsur!kiae!jito From: jito@kiae.su (Jen Ito) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec26.075523.1725@kiae.su> Date: Mon, 26 Dec 1994 07:55:23 GMT References: <1994Dec22.110123.4596@berkeley.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Dec22.110123.4596@berkeley.edu>, tvasiliev@berkeley.edu (Tobias Vasiliev) 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. -- Jen Ito Tape trading list upon request. SASE required for international mail. From tsuzuki@purdue.edu Tue Dec 27 17:14:23 1994 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!tsuzuki From: tsuzuki@purdue.edu (Tomas Suzuki) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Dec27.171423.7119@purdue.edu> Date: Tue, 27 Dec 1994 17:14:23 GMT References: <1994Dec22.110123.4596@berkeley.edu> <1994Dec26.075523.1725@kiae.su> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Dec26.075523.1725@kiae.su>, jito@kiae.su (Jen Ito) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Tomas Suzuki *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0