From rduarte@demon.co.uk Fri Jan 21 11:17:50 1994 Path: ashpoly!cascade!brgate!saturno!demon!rduarte From: rduarte@demon.co.uk (Rodrigo Duarte) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan21.111750.7300@demon.co.uk> Date: Fri, 21 Jan 1994 11:17:50 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Rodrigo Duarte Tape trading list upon request. SASE required for international mail. From ngonzalez@hanse.de Sun Jan 23 12:33:50 1994 Path: ashpoly!cascade!bigsur!hanse!ngonzalez From: ngonzalez@hanse.de (Natalia González) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan23.123350.5282@hanse.de> Date: Sun, 23 Jan 1994 12:33:50 GMT References: <1994Jan21.111750.7300@demon.co.uk> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jan21.111750.7300@demon.co.uk>, rduarte@demon.co.uk (Rodrigo Duarte) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- Natalia González Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg. ------------------------------------------------------------ From ksilva@delphi.com Tue Jan 25 00:38:50 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!ksilva From: ksilva@delphi.com (Kirsty Silva) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jan25.003850.8625@delphi.com> Date: Tue, 25 Jan 1994 00:38:50 GMT References: <1994Jan21.111750.7300@demon.co.uk> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Jan21.111750.7300@demon.co.uk>, rduarte@demon.co.uk (Rodrigo Duarte) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Kirsty Silva "Measuring a record you own is listening, not piracy." Acorn RiscPC 600 / SunOS 4.1.4