From hsuzuki@hanse.de Fri May 26 02:34:50 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!hsuzuki From: hsuzuki@hanse.de (Hana Suzuki) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May26.023450.1825@hanse.de> Date: Fri, 26 May 1995 02:34:50 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. 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? -- Hana Suzuki *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From ygirard@pacbell.net Sun May 28 01:05:50 1995 Path: ashpoly!cascade!mxgate!coyoacan!pacbell!ygirard From: ygirard@pacbell.net (Yuki Girard) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May28.010550.4083@pacbell.net> Date: Sun, 28 May 1995 01:05:50 GMT References: <1995May26.023450.1825@hanse.de> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995May26.023450.1825@hanse.de>, hsuzuki@hanse.de (Hana Suzuki) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. PGP Public key available via finger or upon request. -- Yuki Girard "Extraordinary claims require extraordinary spectra." Atari Falcon 030 / AmigaOS 3.1 From kpark@cmu.edu Mon May 29 05:01:50 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!kpark From: kpark@cmu.edu (Katrin Park) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May29.050150.5520@cmu.edu> Date: Mon, 29 May 1995 05:01:50 GMT References: <1995May26.023450.1825@hanse.de> <1995May28.010550.4083@pacbell.net> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995May28.010550.4083@pacbell.net>, ygirard@pacbell.net (Yuki Girard) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Katrin Park -- Carnegie Mellon University School of CS "A soul is not exclusive to biology." From aweber@berkeley.edu Tue May 30 00:27:50 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!aweber From: aweber@berkeley.edu (Astrid Weber) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May30.002750.2536@berkeley.edu> Date: Tue, 30 May 1995 00:27:50 GMT References: <1995May26.023450.1825@hanse.de> <1995May28.010550.4083@pacbell.net> <1995May29.050150.5520@cmu.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May29.050150.5520@cmu.edu>, kpark@cmu.edu (Katrin Park) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Astrid Weber "Do not worship the copy." NeXTstation Turbo Color / TOS 4.04 From jhughes@tum.de Wed May 31 10:19:50 1995 Path: ashpoly!cascade!brgate!saturno!tum!jhughes From: jhughes@tum.de (Jens Hughes) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995May31.101950.1429@tum.de> Date: Wed, 31 May 1995 10:19:50 GMT References: <1995May26.023450.1825@hanse.de> <1995May28.010550.4083@pacbell.net> <1995May29.050150.5520@cmu.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995May29.050150.5520@cmu.edu>, kpark@cmu.edu (Katrin Park) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Jens Hughes -- Technische Universität München "Hardware is temporary. The signal survives."