From htanaka@delphi.com Sun Apr 09 15:42:30 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!htanaka From: htanaka@delphi.com (Hugo Tanaka) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr09.154230.4606@delphi.com> Date: Sun, 09 Apr 1995 15:42:30 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com 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. 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. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- Hugo Tanaka SupraFAXModem 28.8 @ ISDN 64k bps "Hold for relay." From klindqvist@unam.mx Tue Apr 11 02:47:30 1995 Path: ashpoly!cascade!transat!ukc!fennimore!unam!klindqvist From: klindqvist@unam.mx (Kenji Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr11.024730.4598@unam.mx> Date: Tue, 11 Apr 1995 02:47:30 GMT References: <1995Apr09.154230.4606@delphi.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Apr09.154230.4606@delphi.com>, htanaka@delphi.com (Hugo Tanaka) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > 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. Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? -- === Kenji Lindqvist === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "When every node is whole, the channel opens." From hschneider@demon.co.uk Wed Apr 12 16:19:30 1995 Path: ashpoly!cascade!transat!ukc!fennimore!demon!hschneider From: hschneider@demon.co.uk (Hugo Schneider) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr12.161930.9158@demon.co.uk> Date: Wed, 12 Apr 1995 16:19:30 GMT References: <1995Apr09.154230.4606@delphi.com> <1995Apr11.024730.4598@unam.mx> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Apr11.024730.4598@unam.mx>, klindqvist@unam.mx (Kenji Lindqvist) writes: > Download failed on Aminet mirror. Can someone mail me an ADF floppy disk image? Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Hugo Schneider | hschneider@demon.co.uk PGP Key fingerprint: 29B9 BBB6 B340 FA88 "Keep the channels open."