From jlaurent@pipeline.com Wed Jan 03 08:35:27 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!jlaurent From: jlaurent@pipeline.com (Julien Laurent) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan03.083527.1566@pipeline.com> Date: Wed, 03 Jan 1996 08:35:27 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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! -- === Julien Laurent === Dept of Electrical Engineering, The Pipeline Internet Network "The hatch is open. Is anyone listening?" From dkang@u-tokyo.ac.jp Wed Jan 03 15:39:27 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!dkang From: dkang@u-tokyo.ac.jp (Dmitri Kang) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan03.153927.9759@u-tokyo.ac.jp> Date: Wed, 03 Jan 1996 15:39:27 GMT References: <1996Jan03.083527.1566@pipeline.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jan03.083527.1566@pipeline.com>, jlaurent@pipeline.com (Julien Laurent) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Dmitri Kang | dkang@u-tokyo.ac.jp PGP Key fingerprint: B3C3 07C4 8B15 A336 "Keep the channels open." From mmacdonald@titech.ac.jp Thu Jan 04 08:26:27 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!mmacdonald From: mmacdonald@titech.ac.jp (Min-jun MacDonald) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan04.082627.4315@titech.ac.jp> Date: Thu, 04 Jan 1996 08:26:27 GMT References: <1996Jan03.083527.1566@pipeline.com> <1996Jan03.153927.9759@u-tokyo.ac.jp> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Jan03.153927.9759@u-tokyo.ac.jp>, dkang@u-tokyo.ac.jp (Dmitri Kang) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Min-jun MacDonald Zyxel U-1496E @ 28,800 bps "5 sigma is a discovery. 7 is a question." From hmacdonald@tum.de Thu Jan 04 12:56:27 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!hmacdonald From: hmacdonald@tum.de (Hugo MacDonald) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Jan04.125627.2155@tum.de> Date: Thu, 04 Jan 1996 12:56:27 GMT References: <1996Jan03.083527.1566@pipeline.com> <1996Jan03.153927.9759@u-tokyo.ac.jp> <1996Jan04.082627.4315@titech.ac.jp> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jan04.082627.4315@titech.ac.jp>, mmacdonald@titech.ac.jp (Min-jun MacDonald) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Hugo MacDonald | hmacdonald@tum.de PGP Key fingerprint: ACE4 09E1 8931 DD8D "Keep the channels open."