From fschneider@illinois.edu Thu Oct 20 02:21:57 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!fschneider From: fschneider@illinois.edu (Fiona Schneider) Newsgroups: comp.sys.m68k Subject: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct20.022157.7729@illinois.edu> Date: Thu, 20 Oct 1994 02:21:57 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 10 Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. 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. Does anyone want to test on an unaccelerated Amiga 500 with 512K chip RAM? -- Fiona Schneider Tape trading list upon request. SASE required for international mail. From ssilva@berkeley.edu Thu Oct 20 16:44:57 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!ssilva From: ssilva@berkeley.edu (Sun-mi Silva) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct20.164457.8693@berkeley.edu> Date: Thu, 20 Oct 1994 16:44:57 GMT References: <1994Oct20.022157.7729@illinois.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Oct20.022157.7729@illinois.edu>, fschneider@illinois.edu (Fiona Schneider) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. If you are posting from AOL, please read RFC 1036 before posting again. -- Sun-mi Silva | ssilva@berkeley.edu PGP Key fingerprint: 1AE2 3784 3D57 5518 "Keep the channels open." From nweber@hanse.de Thu Oct 20 22:18:57 1994 Path: ashpoly!cascade!brgate!saturno!hanse!nweber From: nweber@hanse.de (Natalia Weber) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1994Oct20.221857.2542@hanse.de> Date: Thu, 20 Oct 1994 22:18:57 GMT References: <1994Oct20.022157.7729@illinois.edu> <1994Oct20.164457.8693@berkeley.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Oct20.164457.8693@berkeley.edu>, ssilva@berkeley.edu (Sun-mi Silva) 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. Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Natalia Weber Practical Peripherals 14.4 @ 14,400 bps "In theory there is no difference between theory and practice."