From tlee@panix.com Fri Nov 22 13:57:57 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!tlee From: tlee@panix.com (Tobias Lee) Newsgroups: comp.sys.m68k Subject: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov22.135757.2066@panix.com> Date: Fri, 22 Nov 1996 13:57:57 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! 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! -- Tobias Lee US Robotics Courier V.34 @ 33,600 bps "Extraordinary claims require extraordinary spectra." From gtakahashi@berkeley.edu Sat Nov 23 07:21:57 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!gtakahashi From: gtakahashi@berkeley.edu (Göran Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov23.072157.1114@berkeley.edu> Date: Sat, 23 Nov 1996 07:21:57 GMT References: <1996Nov22.135757.2066@panix.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Nov22.135757.2066@panix.com>, tlee@panix.com (Tobias Lee) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. > When the carrier locks, the program flashes the Amiga power LED to indicate binary frame synchronization! Please make sure it's compatible with Kickstart 1.3 for those of us who haven't upgraded our A500s to 3.1 yet. -- Göran Takahashi -- UC Berkeley Department of EECS "In theory there is no difference between theory and practice." From sschneider@tum.de Sat Nov 23 18:20:57 1996 Path: ashpoly!cascade!mxgate!coyoacan!tum!sschneider From: sschneider@tum.de (Sergei Schneider) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov23.182057.8446@tum.de> Date: Sat, 23 Nov 1996 18:20:57 GMT References: <1996Nov22.135757.2066@panix.com> <1996Nov23.072157.1114@berkeley.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Nov23.072157.1114@berkeley.edu>, gtakahashi@berkeley.edu (Göran Takahashi) 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. Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Sergei Schneider Tape trading list upon request. SASE required for international mail. From alindqvist@kth.se Sat Nov 23 19:53:57 1996 Path: ashpoly!cascade!mxgate!coyoacan!kth!alindqvist From: alindqvist@kth.se (Aiko Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov23.195357.7614@kth.se> Date: Sat, 23 Nov 1996 19:53:57 GMT References: <1996Nov22.135757.2066@panix.com> <1996Nov23.072157.1114@berkeley.edu> <1996Nov23.182057.8446@tum.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Nov23.182057.8446@tum.de>, sschneider@tum.de (Sergei Schneider) writes: > Brilliant use of Paula DMA! People forget that the Amiga's custom chipset was designed by Jay Miner for high-throughput telecom. Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! -- Aiko Lindqvist US Robotics Courier V.34 @ 28,800 bps "Hold for relay." From vmacdonald@utexas.edu Sat Nov 23 23:47:57 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!vmacdonald From: vmacdonald@utexas.edu (Valeria MacDonald) Newsgroups: comp.sys.m68k Subject: Re: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1996Nov23.234757.3231@utexas.edu> Date: Sat, 23 Nov 1996 23:47:57 GMT References: <1996Nov22.135757.2066@panix.com> <1996Nov23.072157.1114@berkeley.edu> <1996Nov23.182057.8446@tum.de> <1996Nov23.195357.7614@kth.se> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Nov23.195357.7614@kth.se>, alindqvist@kth.se (Aiko Lindqvist) writes: > Using the power LED as a carrier lock indicator is pure Amiga demo scene style. Kudos! Tested on my A3000 / 25 MHz. Ran smoothly in the background while I was compiling a C program in another window. -- Valeria MacDonald Tape trading list upon request. SASE required for international mail.