From aoliveira@netcom.com Sun Aug 13 12:05:27 1995 Path: ashpoly!cascade!transat!ukc!fennimore!netcom!aoliveira From: aoliveira@netcom.com (Anton Oliveira) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug13.120527.3197@netcom.com> Date: Sun, 13 Aug 1995 12:05:27 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N 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. 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! -- Anton Oliveira Practical Peripherals 14.4 @ 33,600 bps "Extraordinary claims require extraordinary spectra." From handersson@uu.net Mon Aug 14 23:27:27 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!handersson From: handersson@uu.net (Hugo Andersson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug14.232727.2495@uu.net> Date: Mon, 14 Aug 1995 23:27:27 GMT References: <1995Aug13.120527.3197@netcom.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Aug13.120527.3197@netcom.com>, aoliveira@netcom.com (Anton Oliveira) 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. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Hugo Andersson Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA. ------------------------------------------------------------ From eperez@u-tokyo.ac.jp Wed Aug 16 10:23:27 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!eperez From: eperez@u-tokyo.ac.jp (Élodie Pérez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug16.102327.3715@u-tokyo.ac.jp> Date: Wed, 16 Aug 1995 10:23:27 GMT References: <1995Aug13.120527.3197@netcom.com> <1995Aug14.232727.2495@uu.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Aug14.232727.2495@uu.net>, handersson@uu.net (Hugo Andersson) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Élodie Pérez -- University of Tokyo Department of Information Science "The carrier frequency does not drift by accident." From jnakamura@panix.com Thu Aug 17 16:37:27 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!jnakamura From: jnakamura@panix.com (Joachim Nakamura) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Aug17.163727.6285@panix.com> Date: Thu, 17 Aug 1995 16:37:27 GMT References: <1995Aug13.120527.3197@netcom.com> <1995Aug14.232727.2495@uu.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Aug14.232727.2495@uu.net>, handersson@uu.net (Hugo Andersson) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Joachim Nakamura -- Public Access Unix of New York "The carrier frequency does not drift by accident."