From slindqvist@hanse.de Mon Feb 13 22:34:46 1995 Path: ashpoly!cascade!brgate!saturno!hanse!slindqvist From: slindqvist@hanse.de (Sergei Lindqvist) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb13.223446.8462@hanse.de> Date: Mon, 13 Feb 1995 22:34:46 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] 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? -- Sergei Lindqvist | slindqvist@hanse.de PGP Key fingerprint: 7E83 9A00 3AA4 B1F0 "Keep the channels open." From aduarte@uu.net Tue Feb 14 11:06:46 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!aduarte From: aduarte@uu.net (Anja Duarte) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb14.110646.1511@uu.net> Date: Tue, 14 Feb 1995 11:06:46 GMT References: <1995Feb13.223446.8462@hanse.de> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Feb13.223446.8462@hanse.de>, slindqvist@hanse.de (Sergei Lindqvist) 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. PGP Public key available via finger or upon request. -- Anja Duarte Tape trading list upon request. SASE required for international mail. From fkim@hanse.de Tue Feb 14 17:49:46 1995 Path: ashpoly!cascade!bigsur!hanse!fkim From: fkim@hanse.de (Fiona Kim) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Feb14.174946.9616@hanse.de> Date: Tue, 14 Feb 1995 17:49:46 GMT References: <1995Feb13.223446.8462@hanse.de> <1995Feb14.110646.1511@uu.net> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb14.110646.1511@uu.net>, aduarte@uu.net (Anja Duarte) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. > PGP Public key available via finger or upon request. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Fiona Kim *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0