From lrodriguez@panix.com Fri Mar 03 17:54:24 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!lrodriguez From: lrodriguez@panix.com (Lars Rodríguez) Newsgroups: comp.sys.m68k Subject: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar03.175424.7052@panix.com> Date: Fri, 03 Mar 1995 17:54:24 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Lars Rodríguez Tape trading list upon request. SASE required for international mail. From cokonkwo@uni-hamburg.de Sun Mar 05 02:20:24 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!cokonkwo From: cokonkwo@uni-hamburg.de (Camila Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar05.022024.8845@uni-hamburg.de> Date: Sun, 05 Mar 1995 02:20:24 GMT References: <1995Mar03.175424.7052@panix.com> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Mar03.175424.7052@panix.com>, lrodriguez@panix.com (Lars Rodríguez) 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! -- Camila Okonkwo "When every node is whole, the channel opens." Acorn RiscPC 600 / Linux 1.2.13 From llee@inria.fr Mon Mar 06 23:03:24 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!llee From: llee@inria.fr (Lucia Lee) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar06.230324.4699@inria.fr> Date: Mon, 06 Mar 1995 23:03:24 GMT References: <1995Mar03.175424.7052@panix.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Mar03.175424.7052@panix.com>, lrodriguez@panix.com (Lars Rodríguez) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Lucia Lee "The carrier frequency does not drift by accident." Atari Falcon 030 / AmigaOS 3.1 From elarsson@delphi.com Wed Mar 08 16:45:24 1995 Path: ashpoly!cascade!mxgate!coyoacan!delphi!elarsson From: elarsson@delphi.com (Emi Larsson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar08.164524.9066@delphi.com> Date: Wed, 08 Mar 1995 16:45:24 GMT References: <1995Mar03.175424.7052@panix.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar03.175424.7052@panix.com>, lrodriguez@panix.com (Lars Rodríguez) 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Emi Larsson -- Delphi Internet Services "Row 14. No joke." From agirard@mindspring.com Fri Mar 10 03:12:24 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!agirard From: agirard@mindspring.com (Aiko Girard) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar10.031224.6558@mindspring.com> Date: Fri, 10 Mar 1995 03:12:24 GMT References: <1995Mar03.175424.7052@panix.com> <1995Mar05.022024.8845@uni-hamburg.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Mar05.022024.8845@uni-hamburg.de>, cokonkwo@uni-hamburg.de (Camila Okonkwo) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Aiko Girard -- MindSpring Enterprises "They will send a copy in my place."