From bgonzalez@panix.com Sat Oct 26 12:41:09 1996 Path: ashpoly!cascade!transat!ukc!fennimore!panix!bgonzalez From: bgonzalez@panix.com (Bastien González) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct26.124109.8474@panix.com> Date: Sat, 26 Oct 1996 12:41:09 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com 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. 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Bastien González | bgonzalez@panix.com PGP Key fingerprint: 8502 D9F2 EDED AF57 "Keep the channels open." From aweber@uni-hamburg.de Mon Oct 28 08:03:09 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!aweber From: aweber@uni-hamburg.de (Aiko Weber) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct28.080309.8777@uni-hamburg.de> Date: Mon, 28 Oct 1996 08:03:09 GMT References: <1996Oct26.124109.8474@panix.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Oct26.124109.8474@panix.com>, bgonzalez@panix.com (Bastien González) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Aiko Weber Opinions expressed are solely my own and not those of Universität Hamburg Fachbereich Informatik. ------------------------------------------------------------ From aduarte@pipeline.com Mon Oct 28 19:33:09 1996 Path: ashpoly!cascade!mxgate!coyoacan!pipeline!aduarte From: aduarte@pipeline.com (Anja Duarte) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct28.193309.5140@pipeline.com> Date: Mon, 28 Oct 1996 19:33:09 GMT References: <1996Oct26.124109.8474@panix.com> <1996Oct28.080309.8777@uni-hamburg.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Oct28.080309.8777@uni-hamburg.de>, aweber@uni-hamburg.de (Aiko Weber) 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. -- Anja Duarte Practical Peripherals 14.4 @ 9600 Telebit bps "They will send a copy in my place." From cvasiliev@cam.ac.uk Wed Oct 30 16:55:09 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!cam!cvasiliev From: cvasiliev@cam.ac.uk (Camila Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct30.165509.1006@cam.ac.uk> Date: Wed, 30 Oct 1996 16:55:09 GMT References: <1996Oct26.124109.8474@panix.com> <1996Oct28.080309.8777@uni-hamburg.de> <1996Oct28.193309.5140@pipeline.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Oct28.193309.5140@pipeline.com>, aduarte@pipeline.com (Anja Duarte) 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. -- Camila Vasiliev -- University of Cambridge Computer Laboratory "Row 14. No joke." From stanaka@demon.co.uk Thu Oct 31 12:39:09 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!stanaka From: stanaka@demon.co.uk (Sergei Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct31.123909.6064@demon.co.uk> Date: Thu, 31 Oct 1996 12:39:09 GMT References: <1996Oct26.124109.8474@panix.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Oct26.124109.8474@panix.com>, bgonzalez@panix.com (Bastien González) 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Sergei Tanaka | stanaka@demon.co.uk PGP Key fingerprint: 8D32 F752 A131 B850 "Keep the channels open."