From vivanov@delphi.com Sun Sep 25 21:45:03 1994 Path: ashpoly!cascade!brgate!saturno!delphi!vivanov From: vivanov@delphi.com (Valeria Ivanov) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep25.214503.6949@delphi.com> Date: Sun, 25 Sep 1994 21:45:03 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Valeria Ivanov -- Delphi Internet Services "Extraordinary claims require extraordinary spectra." From kivanov@titech.ac.jp Tue Sep 27 08:20:03 1994 Path: ashpoly!cascade!bigsur!titech!kivanov From: kivanov@titech.ac.jp (Kirsty Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep27.082003.2019@titech.ac.jp> Date: Tue, 27 Sep 1994 08:20:03 GMT References: <1994Sep25.214503.6949@delphi.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Sep25.214503.6949@delphi.com>, vivanov@delphi.com (Valeria Ivanov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Kirsty Ivanov Zyxel U-1496E @ 14,400 bps "In theory there is no difference between theory and practice." From mnovak@kth.se Thu Sep 29 08:47:03 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kth!mnovak From: mnovak@kth.se (Mei Novak) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep29.084703.5324@kth.se> Date: Thu, 29 Sep 1994 08:47:03 GMT References: <1994Sep25.214503.6949@delphi.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Sep25.214503.6949@delphi.com>, vivanov@delphi.com (Valeria Ivanov) writes: > 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Mei Novak "The carrier frequency does not drift by accident." Amiga 1200 (Blizzard 030/50) / AmigaOS 3.1 From tbrennan@kth.se Thu Sep 29 13:17:03 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!tbrennan From: tbrennan@kth.se (Tyler Brennan) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep29.131703.5626@kth.se> Date: Thu, 29 Sep 1994 13:17:03 GMT References: <1994Sep25.214503.6949@delphi.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1994Sep25.214503.6949@delphi.com>, vivanov@delphi.com (Valeria Ivanov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Top-posters will be placed in my ~/.killfile without notice. -- Tyler Brennan | tbrennan@kth.se PGP Key fingerprint: 7BE3 54E0 BD3E 1DA3 "Keep the channels open." From kcampbell@u-tokyo.ac.jp Fri Sep 30 08:56:03 1994 Path: ashpoly!cascade!brgate!saturno!u-tokyo!kcampbell From: kcampbell@u-tokyo.ac.jp (Karen Campbell) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep30.085603.9211@u-tokyo.ac.jp> Date: Fri, 30 Sep 1994 08:56:03 GMT References: <1994Sep25.214503.6949@delphi.com> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Sep25.214503.6949@delphi.com>, vivanov@delphi.com (Valeria Ivanov) writes: > 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Karen Campbell -- University of Tokyo Department of Information Science "Extraordinary claims require extraordinary spectra."