From hpopov@uu.net Sun Dec 15 16:32:15 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!hpopov From: hpopov@uu.net (Hana Popov) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec15.163215.3584@uu.net> Date: Sun, 15 Dec 1996 16:32:15 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Hana Popov *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From rmoreno@earthlink.net Mon Dec 16 18:07:15 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!rmoreno From: rmoreno@earthlink.net (Renata Moreno) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec16.180715.8285@earthlink.net> Date: Mon, 16 Dec 1996 18:07:15 GMT References: <1996Dec15.163215.3584@uu.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Dec15.163215.3584@uu.net>, hpopov@uu.net (Hana Popov) 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. -- === Renata Moreno === Dept of Electrical Engineering, EarthLink Network "Row 14. No joke." From sdubois@stanford.edu Wed Dec 18 03:25:15 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!sdubois From: sdubois@stanford.edu (Sun-mi Dubois) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec18.032515.5092@stanford.edu> Date: Wed, 18 Dec 1996 03:25:15 GMT References: <1996Dec15.163215.3584@uu.net> <1996Dec16.180715.8285@earthlink.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Dec16.180715.8285@earthlink.net>, rmoreno@earthlink.net (Renata Moreno) 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. -- Sun-mi Dubois "When every node is whole, the channel opens." Sun SparcStation 20 / NEXTSTEP 3.3 From nsantos@titech.ac.jp Thu Dec 19 18:05:15 1996 Path: ashpoly!cascade!brgate!saturno!titech!nsantos From: nsantos@titech.ac.jp (Nadia Santos) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec19.180515.1867@titech.ac.jp> Date: Thu, 19 Dec 1996 18:05:15 GMT References: <1996Dec15.163215.3584@uu.net> <1996Dec16.180715.8285@earthlink.net> <1996Dec18.032515.5092@stanford.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Dec18.032515.5092@stanford.edu>, sdubois@stanford.edu (Sun-mi Dubois) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Nadia Santos Tape trading list upon request. SASE required for international mail. From bwatanabe@rwth-aachen.de Thu Dec 19 20:19:15 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!bwatanabe From: bwatanabe@rwth-aachen.de (Bill Watanabe) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Dec19.201915.3692@rwth-aachen.de> Date: Thu, 19 Dec 1996 20:19:15 GMT References: <1996Dec15.163215.3584@uu.net> <1996Dec16.180715.8285@earthlink.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Dec16.180715.8285@earthlink.net>, rmoreno@earthlink.net (Renata Moreno) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Bill Watanabe -- RWTH Aachen Informatik "A soul is not exclusive to biology."