From nwatanabe@titech.ac.jp Mon Sep 26 19:18:09 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!nwatanabe From: nwatanabe@titech.ac.jp (Nadine Watanabe) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep26.191809.6839@titech.ac.jp> Date: Mon, 26 Sep 1994 19:18:09 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Nadine Watanabe Tape trading list upon request. SASE required for international mail. From btanaka@earthlink.net Tue Sep 27 17:51:09 1994 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!btanaka From: btanaka@earthlink.net (Bill Tanaka) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Sep27.175109.4907@earthlink.net> Date: Tue, 27 Sep 1994 17:51:09 GMT References: <1994Sep26.191809.6839@titech.ac.jp> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994Sep26.191809.6839@titech.ac.jp>, nwatanabe@titech.ac.jp (Nadine Watanabe) 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Bill Tanaka *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0