From nrodriguez@stanford.edu Sun Jan 22 12:30:08 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!stanford!nrodriguez From: nrodriguez@stanford.edu (Nadia Rodríguez) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan22.123008.7041@stanford.edu> Date: Sun, 22 Jan 1995 12:30:08 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N 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. -- Nadia Rodríguez | nrodriguez@stanford.edu PGP Key fingerprint: D427 18A0 506D 8250 "Keep the channels open." From jrobertson@ox.ac.uk Sun Jan 22 22:50:08 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!jrobertson From: jrobertson@ox.ac.uk (Ji-woo Robertson) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan22.225008.7269@ox.ac.uk> Date: Sun, 22 Jan 1995 22:50:08 GMT References: <1995Jan22.123008.7041@stanford.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan22.123008.7041@stanford.edu>, nrodriguez@stanford.edu (Nadia Rodríguez) writes: > How the 14 ASCII characters per node are encoded into the record groove. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Ji-woo Robertson Hayes Optima 288 @ 9600 Telebit bps "Hold for relay."