From ngarcia@illinois.edu Wed Apr 27 03:22:57 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!ngarcia From: ngarcia@illinois.edu (Nadine García) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Apr27.032257.9425@illinois.edu> Date: Wed, 27 Apr 1994 03:22:57 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- === Nadine García === Dept of Electrical Engineering, University of Illinois Urbana-Champaign "Tape doesn't lie at 02:14. Ears do." From treyes@panix.com Thu Apr 28 00:29:57 1994 Path: ashpoly!cascade!brgate!saturno!panix!treyes From: treyes@panix.com (Tyler Reyes) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Apr28.002957.5180@panix.com> Date: Thu, 28 Apr 1994 00:29:57 GMT References: <1994Apr27.032257.9425@illinois.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Apr27.032257.9425@illinois.edu>, ngarcia@illinois.edu (Nadine García) writes: > How the 14 ASCII characters per node are encoded into the record groove. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Tyler Reyes Practical Peripherals 14.4 @ 19,200 bps "Measuring a record you own is listening, not piracy."