From jpopov@mit.edu Sat Jun 03 17:13:03 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!jpopov From: jpopov@mit.edu (Julien Popov) Newsgroups: comp.sys.m68k Subject: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun03.171303.3287@mit.edu> Date: Sat, 03 Jun 1995 17:13:03 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N 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. Source code and executable will be released on Aminet under mus/misc/stardust_amiga.lha next week. -- === Julien Popov === Dept of Electrical Engineering, Massachusetts Institute of Technology "They will send a copy in my place." From tivanov@panix.com Sun Jun 04 20:02:03 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!tivanov From: tivanov@panix.com (Takeshi Ivanov) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun04.200203.7575@panix.com> Date: Sun, 04 Jun 1995 20:02:03 GMT References: <1995Jun03.171303.3287@mit.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Jun03.171303.3287@mit.edu>, jpopov@mit.edu (Julien Popov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. -- Takeshi Ivanov US Robotics Courier V.34 @ 28,800 bps "Extraordinary claims require extraordinary spectra." From rweber@delphi.com Mon Jun 05 13:23:03 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!delphi!rweber From: rweber@delphi.com (Rodrigo Weber) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Real-time 14.2 Hz demodulation on Amiga Paula audio DMA Message-ID: <1995Jun05.132303.1031@delphi.com> Date: Mon, 05 Jun 1995 13:23:03 GMT References: <1995Jun03.171303.3287@mit.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jun03.171303.3287@mit.edu>, jpopov@mit.edu (Julien Popov) writes: > Testing custom audio input routines on an Amiga 1200 with a standard parallel-port sampler. 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. -- Rodrigo Weber -- Delphi Internet Services "In theory there is no difference between theory and practice."