From sokonkwo@earthlink.net Sat Mar 09 05:22:37 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!sokonkwo From: sokonkwo@earthlink.net (Seo-yeon Okonkwo) Newsgroups: comp.dsp Subject: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Mar09.052237.6397@earthlink.net> Date: Sat, 09 Mar 1996 05:22:37 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 10 Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. 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. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Seo-yeon Okonkwo Tape trading list upon request. SASE required for international mail. From snilsson@mit.edu Sun Mar 10 04:53:37 1996 Path: ashpoly!cascade!brgate!saturno!mit!snilsson From: snilsson@mit.edu (Steve Nilsson) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Mar10.045337.4280@mit.edu> Date: Sun, 10 Mar 1996 04:53:37 GMT References: <1996Mar09.052237.6397@earthlink.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Mar09.052237.6397@earthlink.net>, sokonkwo@earthlink.net (Seo-yeon Okonkwo) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. > 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. -- === Steve Nilsson === Dept of Electrical Engineering, Massachusetts Institute of Technology "Row 14. No joke." From framirez@pacbell.net Sun Mar 10 15:36:37 1996 Path: ashpoly!cascade!bigsur!pacbell!framirez From: framirez@pacbell.net (Freya Ramírez) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Mar10.153637.4065@pacbell.net> Date: Sun, 10 Mar 1996 15:36:37 GMT References: <1996Mar09.052237.6397@earthlink.net> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Mar09.052237.6397@earthlink.net>, sokonkwo@earthlink.net (Seo-yeon Okonkwo) writes: > Differential Binary Phase Shift Keying (DBPSK) parameter extraction results. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Freya Ramírez "The carrier frequency does not drift by accident." Decstation 5000/200 / AmigaOS 3.1 From mdubois@rwth-aachen.de Tue Mar 12 10:45:37 1996 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!mdubois From: mdubois@rwth-aachen.de (Mikhail Dubois) Newsgroups: comp.dsp Subject: Re: [SPECULATION] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Mar12.104537.4600@rwth-aachen.de> Date: Tue, 12 Mar 1996 10:45:37 GMT References: <1996Mar09.052237.6397@earthlink.net> <1996Mar10.153637.4065@pacbell.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Mar10.153637.4065@pacbell.net>, framirez@pacbell.net (Freya Ramírez) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Mikhail Dubois Practical Peripherals 14.4 @ 19,200 bps "When every node is whole, the channel opens."