From nnakamura@cern.ch Tue Dec 26 06:37:44 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!nnakamura From: nnakamura@cern.ch (Nadia Nakamura) Newsgroups: comp.sys.m68k Subject: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec26.063744.1354@cern.ch> Date: Tue, 26 Dec 1995 06:37:44 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch 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. I wrote a 64-tap FIR filter in pure 68k assembly using movem.l and dbra loop unrolling to downsample to 64 Hz. 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. -- Nadia Nakamura Tape trading list upon request. SASE required for international mail. From rrodriguez@panix.com Tue Dec 26 22:42:44 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!rrodriguez From: rrodriguez@panix.com (Raj Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec26.224244.3379@panix.com> Date: Tue, 26 Dec 1995 22:42:44 GMT References: <1995Dec26.063744.1354@cern.ch> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Dec26.063744.1354@cern.ch>, nnakamura@cern.ch (Nadia Nakamura) 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. -- Raj Rodríguez SupraFAXModem 28.8 @ 9600 Telebit bps "There are 14 nodes and only 10 countries. Count again." From ylee@netcom.com Thu Dec 28 01:58:44 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!ylee From: ylee@netcom.com (Yuki Lee) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec28.015844.3010@netcom.com> Date: Thu, 28 Dec 1995 01:58:44 GMT References: <1995Dec26.063744.1354@cern.ch> <1995Dec26.224244.3379@panix.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Dec26.224244.3379@panix.com>, rrodriguez@panix.com (Raj Rodríguez) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. -- Yuki Lee -- NETCOM On-Line Communication Services "They will send a copy in my place." From dlarsson@illinois.edu Thu Dec 28 19:39:44 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!dlarsson From: dlarsson@illinois.edu (Dave Larsson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec28.193944.9759@illinois.edu> Date: Thu, 28 Dec 1995 19:39:44 GMT References: <1995Dec26.063744.1354@cern.ch> <1995Dec26.224244.3379@panix.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Dec26.224244.3379@panix.com>, rrodriguez@panix.com (Raj Rodríguez) writes: > Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Dave Larsson Practical Peripherals 14.4 @ 33,600 bps "There are 14 nodes and only 10 countries. Count again." From mhughes@kth.se Sat Dec 30 16:47:44 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!mhughes From: mhughes@kth.se (Mikhail Hughes) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Dec30.164744.2035@kth.se> Date: Sat, 30 Dec 1995 16:47:44 GMT References: <1995Dec26.063744.1354@cern.ch> <1995Dec26.224244.3379@panix.com> <1995Dec28.193944.9759@illinois.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Dec28.193944.9759@illinois.edu>, dlarsson@illinois.edu (Dave Larsson) writes: > PC users spend $3,000 on Sound Blasters and Pentium chips and still can't do what a $500 Amiga was doing in 1985. > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Mikhail Hughes Tape trading list upon request. SASE required for international mail.