From mmartinez@kiae.su Sat Apr 15 21:11:25 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!mmartinez From: mmartinez@kiae.su (Mathieu Martínez) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr15.211125.2131@kiae.su> Date: Sat, 15 Apr 1995 21:11:25 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Mathieu Martínez Tape trading list upon request. SASE required for international mail. From dmartinez@demon.co.uk Sun Apr 16 06:55:25 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!dmartinez From: dmartinez@demon.co.uk (Diego Martínez) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr16.065525.7421@demon.co.uk> Date: Sun, 16 Apr 1995 06:55:25 GMT References: <1995Apr15.211125.2131@kiae.su> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr15.211125.2131@kiae.su>, mmartinez@kiae.su (Mathieu Martínez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > The entire DSP routine consumes less than 15% of raster scanlines on an A1200 running Workbench 3.1. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Diego Martínez *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From mcampbell@ox.ac.uk Tue Apr 18 08:02:25 1995 Path: ashpoly!cascade!brgate!saturno!ox!mcampbell From: mcampbell@ox.ac.uk (Mateo Campbell) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr18.080225.9022@ox.ac.uk> Date: Tue, 18 Apr 1995 08:02:25 GMT References: <1995Apr15.211125.2131@kiae.su> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Apr15.211125.2131@kiae.su>, mmartinez@kiae.su (Mathieu Martínez) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. > 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! -- Mateo Campbell Tape trading list upon request. SASE required for international mail. From landersson@pacbell.net Wed Apr 19 19:10:25 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!landersson From: landersson@pacbell.net (Lars Andersson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Apr19.191025.7826@pacbell.net> Date: Wed, 19 Apr 1995 19:10:25 GMT References: <1995Apr15.211125.2131@kiae.su> <1995Apr16.065525.7421@demon.co.uk> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Apr16.065525.7421@demon.co.uk>, dmartinez@demon.co.uk (Diego Martínez) writes: > Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Lars Andersson "5 sigma is a discovery. 7 is a question." Acorn RiscPC 600 / FreeBSD 2.1