From tramirez@panix.com Wed Jun 15 16:27:22 1994 Path: ashpoly!cascade!mxgate!coyoacan!panix!tramirez From: tramirez@panix.com (Tomas Ramírez) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun15.162722.5389@panix.com> Date: Wed, 15 Jun 1994 16:27:22 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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! -- Tomas Ramírez Zyxel U-1496E @ 28,800 bps "Extraordinary claims require extraordinary spectra." From kgonzalez@rwth-aachen.de Thu Jun 16 22:45:22 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!rwth-aachen!kgonzalez From: kgonzalez@rwth-aachen.de (Kenji González) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun16.224522.6121@rwth-aachen.de> Date: Thu, 16 Jun 1994 22:45:22 GMT References: <1994Jun15.162722.5389@panix.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Jun15.162722.5389@panix.com>, tramirez@panix.com (Tomas Ramírez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Kenji González Opinions expressed are solely my own and not those of RWTH Aachen Informatik. ------------------------------------------------------------ From enovak@cam.ac.uk Sun Jun 19 01:53:22 1994 Path: ashpoly!cascade!transat!ukc!fennimore!cam!enovak From: enovak@cam.ac.uk (Elaine Novak) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun19.015322.8524@cam.ac.uk> Date: Sun, 19 Jun 1994 01:53:22 GMT References: <1994Jun15.162722.5389@panix.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Jun15.162722.5389@panix.com>, tramirez@panix.com (Tomas Ramírez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Elaine Novak -- University of Cambridge Computer Laboratory "The hatch is open. Is anyone listening?" From dpetrov@unam.mx Sun Jun 19 15:46:22 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!dpetrov From: dpetrov@unam.mx (Diego Petrov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun19.154622.8840@unam.mx> Date: Sun, 19 Jun 1994 15:46:22 GMT References: <1994Jun15.162722.5389@panix.com> <1994Jun19.015322.8524@cam.ac.uk> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Jun19.015322.8524@cam.ac.uk>, enovak@cam.ac.uk (Elaine Novak) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Diego Petrov Tape trading list upon request. SASE required for international mail. From mito@berkeley.edu Mon Jun 20 10:24:22 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!mito From: mito@berkeley.edu (Marta Ito) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun20.102422.2233@berkeley.edu> Date: Mon, 20 Jun 1994 10:24:22 GMT References: <1994Jun15.162722.5389@panix.com> <1994Jun19.015322.8524@cam.ac.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jun19.015322.8524@cam.ac.uk>, enovak@cam.ac.uk (Elaine Novak) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Marta Ito Tape trading list upon request. SASE required for international mail.