From mperez@titech.ac.jp Tue Nov 14 04:55:36 1995 Path: ashpoly!cascade!transat!ukc!fennimore!titech!mperez From: mperez@titech.ac.jp (Marta Pérez) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov14.045536.1228@titech.ac.jp> Date: Tue, 14 Nov 1995 04:55:36 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp 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. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Marta Pérez "We don't sign stars. We build them." Commodore Amiga 500 (1MB OCS) / FreeBSD 2.1 From tgirard@pacbell.net Tue Nov 14 09:54:36 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!tgirard From: tgirard@pacbell.net (Thiago Girard) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov14.095436.1023@pacbell.net> Date: Tue, 14 Nov 1995 09:54:36 GMT References: <1995Nov14.045536.1228@titech.ac.jp> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov14.045536.1228@titech.ac.jp>, mperez@titech.ac.jp (Marta Pérez) 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. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Thiago Girard Tape trading list upon request. SASE required for international mail.