From rgarcia@kiae.su Wed May 17 08:37:04 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!rgarcia From: rgarcia@kiae.su (Rodrigo García) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May17.083704.3127@kiae.su> Date: Wed, 17 May 1995 08:37:04 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Rodrigo García -- Kurchatov Institute of Atomic Energy, Moscow "Marcus is not one man." From dkowalski@ox.ac.uk Thu May 18 19:33:04 1995 Path: ashpoly!cascade!mxgate!coyoacan!ox!dkowalski From: dkowalski@ox.ac.uk (Dong-hyun Kowalski) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May18.193304.8814@ox.ac.uk> Date: Thu, 18 May 1995 19:33:04 GMT References: <1995May17.083704.3127@kiae.su> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May17.083704.3127@kiae.su>, rgarcia@kiae.su (Rodrigo García) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > 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. -- === Dong-hyun Kowalski === Dept of Electrical Engineering, Oxford University Computing Laboratory "A soul is not exclusive to biology." From mnovak@uni-hamburg.de Sat May 20 23:26:04 1995 Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!mnovak From: mnovak@uni-hamburg.de (Mike Novak) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May20.232604.9631@uni-hamburg.de> Date: Sat, 20 May 1995 23:26:04 GMT References: <1995May17.083704.3127@kiae.su> <1995May18.193304.8814@ox.ac.uk> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May18.193304.8814@ox.ac.uk>, dkowalski@ox.ac.uk (Dong-hyun Kowalski) 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. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Mike Novak "Tape doesn't lie at 02:14. Ears do." Mac IIci / 68882 FPU / SunOS 4.1.4 From rjohansson@panix.com Mon May 22 18:39:04 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!rjohansson From: rjohansson@panix.com (Renata Johansson) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May22.183904.1291@panix.com> Date: Mon, 22 May 1995 18:39:04 GMT References: <1995May17.083704.3127@kiae.su> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995May17.083704.3127@kiae.su>, rgarcia@kiae.su (Rodrigo García) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > 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. -- === Renata Johansson === Dept of Electrical Engineering, Public Access Unix of New York "They will send a copy in my place."