From gpetrov@demon.co.uk Tue Jun 07 09:00:40 1994 Path: ashpoly!cascade!brgate!saturno!demon!gpetrov From: gpetrov@demon.co.uk (Graham Petrov) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun07.090040.2041@demon.co.uk> Date: Tue, 07 Jun 1994 09:00:40 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk 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. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Graham Petrov *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From nmoreau@uu.net Thu Jun 09 08:05:40 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!nmoreau From: nmoreau@uu.net (Natalia Moreau) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun09.080540.5205@uu.net> Date: Thu, 09 Jun 1994 08:05:40 GMT References: <1994Jun07.090040.2041@demon.co.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Jun07.090040.2041@demon.co.uk>, gpetrov@demon.co.uk (Graham Petrov) 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! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Natalia Moreau "Hardware is temporary. The signal survives." NeXTstation Turbo Color / AmigaOS 3.1 From tandersson@hanse.de Fri Jun 10 01:20:40 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!tandersson From: tandersson@hanse.de (Tobias Andersson) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Jun10.012040.8036@hanse.de> Date: Fri, 10 Jun 1994 01:20:40 GMT References: <1994Jun07.090040.2041@demon.co.uk> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Jun07.090040.2041@demon.co.uk>, gpetrov@demon.co.uk (Graham Petrov) writes: > Wrote an Amiga assembly program that uses Paula's DMA audio channels to sample and track the Stardust subcarrier. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- === Tobias Andersson === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "Measuring a record you own is listening, not piracy."