From npopov@unam.mx Fri Mar 03 07:42:08 1995 Path: ashpoly!cascade!brgate!saturno!unam!npopov From: npopov@unam.mx (Nadine Popov) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar03.074208.7248@unam.mx> Date: Fri, 03 Mar 1995 07:42:08 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Nadine Popov -- Universidad Nacional Autónoma de México (DGSCA) "They will send a copy in my place." From pmoreau@clari.net Sat Mar 04 11:39:08 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!pmoreau From: pmoreau@clari.net (Pavel Moreau) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar04.113908.2343@clari.net> Date: Sat, 04 Mar 1995 11:39:08 GMT References: <1995Mar03.074208.7248@unam.mx> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Mar03.074208.7248@unam.mx>, npopov@unam.mx (Nadine 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! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Pavel Moreau "The carrier frequency does not drift by accident." Acorn RiscPC 600 / FreeBSD 2.1 From ghughes@panix.com Mon Mar 06 14:07:08 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!ghughes From: ghughes@panix.com (Göran Hughes) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Mar06.140708.8159@panix.com> Date: Mon, 06 Mar 1995 14:07:08 GMT References: <1995Mar03.074208.7248@unam.mx> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Mar03.074208.7248@unam.mx>, npopov@unam.mx (Nadine 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! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Göran Hughes -- Public Access Unix of New York "Row 14. No joke."