From aito@uu.net Mon Mar 13 21:51:35 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!aito From: aito@uu.net (Anton Ito) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar13.215135.1737@uu.net> Date: Mon, 13 Mar 1995 21:51:35 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Anton Ito Zyxel U-1496E @ ISDN 64k bps "Do not worship the copy." From mrobertson@uni-hamburg.de Wed Mar 15 22:18:35 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!mrobertson From: mrobertson@uni-hamburg.de (Morag Robertson) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Mar15.221835.2566@uni-hamburg.de> Date: Wed, 15 Mar 1995 22:18:35 GMT References: <1995Mar13.215135.1737@uu.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Mar13.215135.1737@uu.net>, aito@uu.net (Anton Ito) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Morag Robertson *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0