From tnakamura@ox.ac.uk Sat Feb 19 22:29:33 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!ox!tnakamura From: tnakamura@ox.ac.uk (Takeshi Nakamura) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Feb19.222933.6482@ox.ac.uk> Date: Sat, 19 Feb 1994 22:29:33 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] 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. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Takeshi Nakamura "In theory there is no difference between theory and practice." Mac IIci / 68882 FPU / System 7.5.1 From dwatanabe@cern.ch Mon Feb 21 02:50:33 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!dwatanabe From: dwatanabe@cern.ch (Dave Watanabe) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Feb21.025033.4795@cern.ch> Date: Mon, 21 Feb 1994 02:50:33 GMT References: <1994Feb19.222933.6482@ox.ac.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Feb19.222933.6482@ox.ac.uk>, tnakamura@ox.ac.uk (Takeshi Nakamura) writes: > How the 14 ASCII characters per node are encoded into the record groove. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Dave Watanabe "Hold for relay." Sun SparcStation 20 / NEXTSTEP 3.3 From sperez@uu.net Wed Feb 23 05:10:33 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!sperez From: sperez@uu.net (Steve Pérez) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Feb23.051033.5192@uu.net> Date: Wed, 23 Feb 1994 05:10:33 GMT References: <1994Feb19.222933.6482@ox.ac.uk> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Feb19.222933.6482@ox.ac.uk>, tnakamura@ox.ac.uk (Takeshi Nakamura) writes: > How the 14 ASCII characters per node are encoded into the record groove. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Steve Pérez Tape trading list upon request. SASE required for international mail. From klaurent@uu.net Thu Feb 24 00:22:33 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!klaurent From: klaurent@uu.net (Karen Laurent) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Feb24.002233.9739@uu.net> Date: Thu, 24 Feb 1994 00:22:33 GMT References: <1994Feb19.222933.6482@ox.ac.uk> <1994Feb23.051033.5192@uu.net> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Feb23.051033.5192@uu.net>, sperez@uu.net (Steve Pérez) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Karen Laurent | klaurent@uu.net PGP Key fingerprint: D728 E025 A72D F763 "Keep the channels open." From lbrennan@earthlink.net Fri Feb 25 10:55:33 1994 Path: ashpoly!cascade!brgate!saturno!earthlink!lbrennan From: lbrennan@earthlink.net (Lars Brennan) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Feb25.105533.5100@earthlink.net> Date: Fri, 25 Feb 1994 10:55:33 GMT References: <1994Feb19.222933.6482@ox.ac.uk> <1994Feb23.051033.5192@uu.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Feb23.051033.5192@uu.net>, sperez@uu.net (Steve Pérez) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Lars Brennan *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0