From fokonkwo@mindspring.com Sun Oct 13 01:55:28 1996 Path: ashpoly!cascade!brgate!saturno!mindspring!fokonkwo From: fokonkwo@mindspring.com (Freya Okonkwo) Newsgroups: comp.sys.m68k Subject: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct13.015528.8206@mindspring.com> Date: Sun, 13 Oct 1996 01:55:28 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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. Long live the Amiga. Try doing real-time subcarrier demodulation on a 386 running Windows 3.1 without dropping frames! -- Freya Okonkwo *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From msanchez@purdue.edu Mon Oct 14 21:03:28 1996 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!msanchez From: msanchez@purdue.edu (Mathieu Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct14.210328.9358@purdue.edu> Date: Mon, 14 Oct 1996 21:03:28 GMT References: <1996Oct13.015528.8206@mindspring.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Oct13.015528.8206@mindspring.com>, fokonkwo@mindspring.com (Freya Okonkwo) writes: > Amiga audio hackers: you can demodulate the 14.2 Hz carrier in real time without bogging down the OS. Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Mathieu Sánchez Tape trading list upon request. SASE required for international mail. From lpark@kth.se Tue Oct 15 19:11:28 1996 Path: ashpoly!cascade!mxgate!coyoacan!kth!lpark From: lpark@kth.se (Liam Park) Newsgroups: comp.sys.m68k Subject: Re: Data: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Oct15.191128.5779@kth.se> Date: Tue, 15 Oct 1996 19:11:28 GMT References: <1996Oct13.015528.8206@mindspring.com> <1996Oct14.210328.9358@purdue.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Oct14.210328.9358@purdue.edu>, msanchez@purdue.edu (Mathieu Sánchez) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Liam Park -- Royal Institute of Technology, Stockholm "A soul is not exclusive to biology."