From mkarlsson@berkeley.edu Tue Jan 11 02:49:24 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!berkeley!mkarlsson From: mkarlsson@berkeley.edu (Mikhail Karlsson) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan11.024924.8372@berkeley.edu> Date: Tue, 11 Jan 1994 02:49:24 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Mikhail Karlsson | mkarlsson@berkeley.edu PGP Key fingerprint: C1F6 7146 B19D 8AE5 "Keep the channels open." From gandersson@illinois.edu Tue Jan 11 20:01:24 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!gandersson From: gandersson@illinois.edu (Graham Andersson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan11.200124.5901@illinois.edu> Date: Tue, 11 Jan 1994 20:01:24 GMT References: <1994Jan11.024924.8372@berkeley.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jan11.024924.8372@berkeley.edu>, mkarlsson@berkeley.edu (Mikhail Karlsson) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Graham Andersson *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From nnilsson@mindspring.com Thu Jan 13 16:55:24 1994 Path: ashpoly!cascade!bigsur!mindspring!nnilsson From: nnilsson@mindspring.com (Nadia Nilsson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan13.165524.6662@mindspring.com> Date: Thu, 13 Jan 1994 16:55:24 GMT References: <1994Jan11.024924.8372@berkeley.edu> <1994Jan11.200124.5901@illinois.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jan11.200124.5901@illinois.edu>, gandersson@illinois.edu (Graham Andersson) writes: > Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Nadia Nilsson Zyxel U-1496E @ 14,400 bps "A soul is not exclusive to biology."