From jokonkwo@rwth-aachen.de Thu Jun 22 08:20:15 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!jokonkwo From: jokonkwo@rwth-aachen.de (Ji-woo Okonkwo) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun22.082015.9617@rwth-aachen.de> Date: Thu, 22 Jun 1995 08:20:15 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. By setting up Paula's audio DMA to double-buffer incoming 8-bit samples, the 68020 has plenty of cycles left for the Costas loop. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Ji-woo Okonkwo US Robotics Courier V.34 @ ISDN 64k bps "A soul is not exclusive to biology." From vsokolov@uni-hamburg.de Fri Jun 23 03:17:15 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!vsokolov From: vsokolov@uni-hamburg.de (Valeria Sokolov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun23.031715.1205@uni-hamburg.de> Date: Fri, 23 Jun 1995 03:17:15 GMT References: <1995Jun22.082015.9617@rwth-aachen.de> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jun22.082015.9617@rwth-aachen.de>, jokonkwo@rwth-aachen.de (Ji-woo Okonkwo) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Valeria Sokolov === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "Measuring a record you own is listening, not piracy." From achoi@demon.co.uk Sun Jun 25 05:08:15 1995 Path: ashpoly!cascade!bigsur!demon!achoi From: achoi@demon.co.uk (Aiko Choi) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun25.050815.7281@demon.co.uk> Date: Sun, 25 Jun 1995 05:08:15 GMT References: <1995Jun22.082015.9617@rwth-aachen.de> <1995Jun23.031715.1205@uni-hamburg.de> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jun23.031715.1205@uni-hamburg.de>, vsokolov@uni-hamburg.de (Valeria Sokolov) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. -- === Aiko Choi === Dept of Electrical Engineering, Demon Internet Services UK "Hardware is temporary. The signal survives."