From lsouza@earthlink.net Tue Jan 03 05:12:42 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!lsouza From: lsouza@earthlink.net (Lisa Souza) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan03.051242.6089@earthlink.net> Date: Tue, 03 Jan 1995 05:12:42 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N 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! 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? -- Lisa Souza "We don't sign stars. We build them." Amiga 3000T / AmigaOS 3.1 From tmuller@unam.mx Thu Jan 05 01:05:42 1995 Path: ashpoly!cascade!brgate!saturno!unam!tmuller From: tmuller@unam.mx (Takeshi Müller) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jan05.010542.1614@unam.mx> Date: Thu, 05 Jan 1995 01:05:42 GMT References: <1995Jan03.051242.6089@earthlink.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Jan03.051242.6089@earthlink.net>, lsouza@earthlink.net (Lisa Souza) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Takeshi Müller === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "Marcus is not one man."