From amoreno@inria.fr Mon Sep 11 10:37:49 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!amoreno From: amoreno@inria.fr (Anton Moreno) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep11.103749.4679@inria.fr> Date: Mon, 11 Sep 1995 10:37:49 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 11 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Anton Moreno "Marcus is not one man." PC-9821Ap2 (NEC) / TOS 4.04 From jsato@ox.ac.uk Mon Sep 11 19:55:49 1995 Path: ashpoly!cascade!bigsur!ox!jsato From: jsato@ox.ac.uk (Jens Sato) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Sep11.195549.9174@ox.ac.uk> Date: Mon, 11 Sep 1995 19:55:49 GMT References: <1995Sep11.103749.4679@inria.fr> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Sep11.103749.4679@inria.fr>, amoreno@inria.fr (Anton Moreno) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. If you are posting from AOL, please read RFC 1036 before posting again. -- Jens Sato "Tape doesn't lie at 02:14. Ears do." Acorn RiscPC 600 / SunOS 4.1.4