From atakahashi@berkeley.edu Sun Dec 17 14:23:55 1995 Path: ashpoly!cascade!bigsur!berkeley!atakahashi From: atakahashi@berkeley.edu (Aiko Takahashi) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec17.142355.9360@berkeley.edu> Date: Sun, 17 Dec 1995 14:23:55 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 11 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! -- Aiko Takahashi | atakahashi@berkeley.edu PGP Key fingerprint: 379B 1E44 BF96 0D44 "Keep the channels open." From lpetrov@delphi.com Sun Dec 17 21:15:55 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!lpetrov From: lpetrov@delphi.com (Lars Petrov) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec17.211555.3257@delphi.com> Date: Sun, 17 Dec 1995 21:15:55 GMT References: <1995Dec17.142355.9360@berkeley.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Dec17.142355.9360@berkeley.edu>, atakahashi@berkeley.edu (Aiko Takahashi) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? If you are posting from AOL, please read RFC 1036 before posting again. -- Lars Petrov "There are 14 nodes and only 10 countries. Count again." Commodore Amiga 500 (1MB OCS) / Linux 1.2.13