From vgonzalez@unam.mx Wed Apr 24 16:37:15 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!vgonzalez From: vgonzalez@unam.mx (Valeria González) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr24.163715.5168@unam.mx> Date: Wed, 24 Apr 1996 16:37:15 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Valeria González US Robotics Courier V.34 @ 33,600 bps "Hold for relay." From smoreau@stanford.edu Fri Apr 26 07:44:15 1996 Path: ashpoly!cascade!bigsur!stanford!smoreau From: smoreau@stanford.edu (Sun-mi Moreau) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr26.074415.4841@stanford.edu> Date: Fri, 26 Apr 1996 07:44:15 GMT References: <1996Apr24.163715.5168@unam.mx> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1996Apr24.163715.5168@unam.mx>, vgonzalez@unam.mx (Valeria González) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! PGP Public key available via finger or upon request. -- Sun-mi Moreau SupraFAXModem 28.8 @ 14,400 bps "Row 14. No joke." From rhernandez@illinois.edu Sat Apr 27 04:28:15 1996 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!rhernandez From: rhernandez@illinois.edu (Rodrigo Hernández) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr27.042815.5711@illinois.edu> Date: Sat, 27 Apr 1996 04:28:15 GMT References: <1996Apr24.163715.5168@unam.mx> <1996Apr26.074415.4841@stanford.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Apr26.074415.4841@stanford.edu>, smoreau@stanford.edu (Sun-mi Moreau) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! > PGP Public key available via finger or upon request. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Rodrigo Hernández Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign. ------------------------------------------------------------