From mgonzalez@berkeley.edu Fri Jan 28 20:18:02 1994 Path: ashpoly!cascade!bigsur!berkeley!mgonzalez From: mgonzalez@berkeley.edu (Marta González) Newsgroups: comp.dsp Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan28.201802.5069@berkeley.edu> Date: Fri, 28 Jan 1994 20:18:02 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. 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'. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Marta González "We don't sign stars. We build them." PC-9821Ap2 (NEC) / NEXTSTEP 3.3 From llindqvist@u-tokyo.ac.jp Sat Jan 29 12:15:02 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!llindqvist From: llindqvist@u-tokyo.ac.jp (Lars Lindqvist) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan29.121502.9331@u-tokyo.ac.jp> Date: Sat, 29 Jan 1994 12:15:02 GMT References: <1994Jan28.201802.5069@berkeley.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jan28.201802.5069@berkeley.edu>, mgonzalez@berkeley.edu (Marta González) writes: > How the 14 ASCII characters per node are encoded into the record groove. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Lars Lindqvist Tape trading list upon request. SASE required for international mail. From ttakahashi@titech.ac.jp Sun Jan 30 17:08:02 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!ttakahashi From: ttakahashi@titech.ac.jp (Tobias Takahashi) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan30.170802.9183@titech.ac.jp> Date: Sun, 30 Jan 1994 17:08:02 GMT References: <1994Jan28.201802.5069@berkeley.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jan28.201802.5069@berkeley.edu>, mgonzalez@berkeley.edu (Marta González) writes: > How the 14 ASCII characters per node are encoded into the record groove. > Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Tobias Takahashi "Measuring a record you own is listening, not piracy." 486DX4/100 (FreeBSD 2.0.5) / SunOS 4.1.4