From rsmirnov@purdue.edu Fri Oct 11 20:13:46 1996 Path: ashpoly!cascade!mxgate!coyoacan!purdue!rsmirnov From: rsmirnov@purdue.edu (Renata Smirnov) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct11.201346.2833@purdue.edu> Date: Fri, 11 Oct 1996 20:13:46 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Renata Smirnov *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From nramirez@clari.net Sat Oct 12 20:18:46 1996 Path: ashpoly!cascade!mxgate!coyoacan!clari!nramirez From: nramirez@clari.net (Nadine Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct12.201846.5799@clari.net> Date: Sat, 12 Oct 1996 20:18:46 GMT References: <1996Oct11.201346.2833@purdue.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Oct11.201346.2833@purdue.edu>, rsmirnov@purdue.edu (Renata Smirnov) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Nadine Ramírez -- ClariNet Communications Corp "Hardware is temporary. The signal survives." From asouza@utexas.edu Sun Oct 13 09:34:46 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!asouza From: asouza@utexas.edu (Anton Souza) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct13.093446.9000@utexas.edu> Date: Sun, 13 Oct 1996 09:34:46 GMT References: <1996Oct11.201346.2833@purdue.edu> <1996Oct12.201846.5799@clari.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1996Oct12.201846.5799@clari.net>, nramirez@clari.net (Nadine Ramírez) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- === Anton Souza === Dept of Electrical Engineering, University of Texas at Austin "In theory there is no difference between theory and practice."