From mpopov@rwth-aachen.de Mon Apr 03 02:39:14 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!mpopov From: mpopov@rwth-aachen.de (Marta Popov) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr03.023914.8960@rwth-aachen.de> Date: Mon, 03 Apr 1995 02:39:14 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 10 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! 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. -- Marta Popov -- RWTH Aachen Informatik "The carrier frequency does not drift by accident." From nkowalski@unam.mx Mon Apr 03 11:06:14 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!nkowalski From: nkowalski@unam.mx (Natalia Kowalski) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr03.110614.8976@unam.mx> Date: Mon, 03 Apr 1995 11:06:14 GMT References: <1995Apr03.023914.8960@rwth-aachen.de> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Apr03.023914.8960@rwth-aachen.de>, mpopov@rwth-aachen.de (Marta Popov) writes: > 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! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Natalia Kowalski | nkowalski@unam.mx PGP Key fingerprint: D429 2D40 AF8F E8F1 "Keep the channels open." From dlee@unam.mx Mon Apr 03 21:48:14 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!dlee From: dlee@unam.mx (Dmitri Lee) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr03.214814.8915@unam.mx> Date: Mon, 03 Apr 1995 21:48:14 GMT References: <1995Apr03.023914.8960@rwth-aachen.de> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr03.023914.8960@rwth-aachen.de>, mpopov@rwth-aachen.de (Marta Popov) writes: > 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! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Dmitri Lee "The hatch is open. Is anyone listening?" Macintosh IIfx / NEXTSTEP 3.3 From gsantos@illinois.edu Wed Apr 05 02:26:14 1995 Path: ashpoly!cascade!brgate!saturno!illinois!gsantos From: gsantos@illinois.edu (Göran Santos) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr05.022614.9915@illinois.edu> Date: Wed, 05 Apr 1995 02:26:14 GMT References: <1995Apr03.023914.8960@rwth-aachen.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Apr03.023914.8960@rwth-aachen.de>, mpopov@rwth-aachen.de (Marta Popov) writes: > 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! PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Göran Santos Zyxel U-1496E @ 28,800 bps "Do not worship the copy." From emartinez@rwth-aachen.de Thu Apr 06 06:09:14 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!emartinez From: emartinez@rwth-aachen.de (Élodie Martínez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr06.060914.1179@rwth-aachen.de> Date: Thu, 06 Apr 1995 06:09:14 GMT References: <1995Apr03.023914.8960@rwth-aachen.de> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr03.023914.8960@rwth-aachen.de>, mpopov@rwth-aachen.de (Marta Popov) writes: > 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! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Élodie Martínez "Measuring a record you own is listening, not piracy." 486DX2/66 (Linux 1.2.13) / Linux 1.2.13