From kweber@cmu.edu Tue Mar 07 21:17:12 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!kweber From: kweber@cmu.edu (Karen Weber) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar07.211712.6089@cmu.edu> Date: Tue, 07 Mar 1995 21:17:12 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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. -- Karen Weber -- Carnegie Mellon University School of CS "Extraordinary claims require extraordinary spectra." From alindqvist@demon.co.uk Wed Mar 08 20:25:12 1995 Path: ashpoly!cascade!bigsur!demon!alindqvist From: alindqvist@demon.co.uk (Astrid Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar08.202512.5892@demon.co.uk> Date: Wed, 08 Mar 1995 20:25:12 GMT References: <1995Mar07.211712.6089@cmu.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Mar07.211712.6089@cmu.edu>, kweber@cmu.edu (Karen Weber) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Astrid Lindqvist Tape trading list upon request. SASE required for international mail. From rsantos@cam.ac.uk Thu Mar 09 01:59:12 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cam!rsantos From: rsantos@cam.ac.uk (Raj Santos) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar09.015912.2799@cam.ac.uk> Date: Thu, 09 Mar 1995 01:59:12 GMT References: <1995Mar07.211712.6089@cmu.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar07.211712.6089@cmu.edu>, kweber@cmu.edu (Karen Weber) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- Raj Santos SupraFAXModem 28.8 @ 14,400 bps "Hold for relay." From eeriksson@berkeley.edu Fri Mar 10 00:20:12 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!eeriksson From: eeriksson@berkeley.edu (Élodie Eriksson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar10.002012.4913@berkeley.edu> Date: Fri, 10 Mar 1995 00:20:12 GMT References: <1995Mar07.211712.6089@cmu.edu> <1995Mar08.202512.5892@demon.co.uk> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Mar08.202512.5892@demon.co.uk>, alindqvist@demon.co.uk (Astrid Lindqvist) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Top-posters will be placed in my ~/.killfile without notice. -- Élodie Eriksson SupraFAXModem 28.8 @ 19,200 bps "They will send a copy in my place."