From vpetrov@utexas.edu Fri Apr 19 23:48:49 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!vpetrov From: vpetrov@utexas.edu (Valeria Petrov) Newsgroups: comp.sys.m68k Subject: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr19.234849.3814@utexas.edu> Date: Fri, 19 Apr 1996 23:48:49 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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 Petrov | vpetrov@utexas.edu PGP Key fingerprint: DBCD 397A 0E45 70FF "Keep the channels open." From mweber@tum.de Sun Apr 21 07:36:49 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!mweber From: mweber@tum.de (Mei Weber) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr21.073649.6838@tum.de> Date: Sun, 21 Apr 1996 07:36:49 GMT References: <1996Apr19.234849.3814@utexas.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Apr19.234849.3814@utexas.edu>, vpetrov@utexas.edu (Valeria Petrov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Mei Weber *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From hgonzalez@netcom.com Sun Apr 21 13:50:49 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!netcom!hgonzalez From: hgonzalez@netcom.com (Heather González) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr21.135049.9672@netcom.com> Date: Sun, 21 Apr 1996 13:50:49 GMT References: <1996Apr19.234849.3814@utexas.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Apr19.234849.3814@utexas.edu>, vpetrov@utexas.edu (Valeria Petrov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Heather González "Row 14. No joke." PC-9821Ap2 (NEC) / System 7.5.1 From nkowalski@stanford.edu Mon Apr 22 04:33:49 1996 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!nkowalski From: nkowalski@stanford.edu (Nadine Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Question: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Apr22.043349.8355@stanford.edu> Date: Mon, 22 Apr 1996 04:33:49 GMT References: <1996Apr19.234849.3814@utexas.edu> <1996Apr21.073649.6838@tum.de> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Apr21.073649.6838@tum.de>, mweber@tum.de (Mei Weber) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Nadine Kowalski | nkowalski@stanford.edu PGP Key fingerprint: 8DC9 FE1E 3073 6B89 "Keep the channels open."