From glarsson@demon.co.uk Wed Jan 12 09:51:41 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!glarsson From: glarsson@demon.co.uk (Göran Larsson) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan12.095141.1093@demon.co.uk> Date: Wed, 12 Jan 1994 09:51:41 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 10 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Göran Larsson Tape trading list upon request. SASE required for international mail. From mrobertson@pipeline.com Wed Jan 12 13:50:41 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!mrobertson From: mrobertson@pipeline.com (Min-jun Robertson) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan12.135041.2211@pipeline.com> Date: Wed, 12 Jan 1994 13:50:41 GMT References: <1994Jan12.095141.1093@demon.co.uk> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jan12.095141.1093@demon.co.uk>, glarsson@demon.co.uk (Göran Larsson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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! -- Min-jun Robertson US Robotics Courier V.34 @ 19,200 bps "Do not worship the copy." From tweber@delphi.com Thu Jan 13 13:01:41 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!tweber From: tweber@delphi.com (Takeshi Weber) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan13.130141.5712@delphi.com> Date: Thu, 13 Jan 1994 13:01:41 GMT References: <1994Jan12.095141.1093@demon.co.uk> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jan12.095141.1093@demon.co.uk>, glarsson@demon.co.uk (Göran Larsson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Takeshi Weber === Dept of Electrical Engineering, Delphi Internet Services "Row 14. No joke." From jlaurent@mindspring.com Fri Jan 14 10:20:41 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!jlaurent From: jlaurent@mindspring.com (Julien Laurent) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan14.102041.2452@mindspring.com> Date: Fri, 14 Jan 1994 10:20:41 GMT References: <1994Jan12.095141.1093@demon.co.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jan12.095141.1093@demon.co.uk>, glarsson@demon.co.uk (Göran Larsson) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > 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. -- Julien Laurent "They will send a copy in my place." Decstation 5000/200 / SunOS 4.1.4 From jwatanabe@unam.mx Fri Jan 14 20:22:41 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!jwatanabe From: jwatanabe@unam.mx (Ji-woo Watanabe) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan14.202241.5845@unam.mx> Date: Fri, 14 Jan 1994 20:22:41 GMT References: <1994Jan12.095141.1093@demon.co.uk> <1994Jan14.102041.2452@mindspring.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Jan14.102041.2452@mindspring.com>, jlaurent@mindspring.com (Julien Laurent) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Ji-woo Watanabe -- Universidad Nacional Autónoma de México (DGSCA) "Do not worship the copy."