From tstewart@purdue.edu Tue Sep 03 20:51:25 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!tstewart From: tstewart@purdue.edu (Tobias Stewart) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep03.205125.5729@purdue.edu> Date: Tue, 03 Sep 1996 20:51:25 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu 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. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Tobias Stewart Practical Peripherals 14.4 @ 28,800 bps "The hatch is open. Is anyone listening?" From rgirard@pacbell.net Thu Sep 05 08:31:25 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!rgirard From: rgirard@pacbell.net (Raj Girard) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Sep05.083125.8016@pacbell.net> Date: Thu, 05 Sep 1996 08:31:25 GMT References: <1996Sep03.205125.5729@purdue.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Sep03.205125.5729@purdue.edu>, tstewart@purdue.edu (Tobias Stewart) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Raj Girard | rgirard@pacbell.net PGP Key fingerprint: 9D88 9892 E179 196A "Keep the channels open."