From alindqvist@mindspring.com Mon Jun 20 00:07:18 1994 Path: ashpoly!cascade!brgate!saturno!mindspring!alindqvist From: alindqvist@mindspring.com (Anton Lindqvist) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun20.000718.5072@mindspring.com> Date: Mon, 20 Jun 1994 00:07:18 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 How the 14 ASCII characters per node are encoded into the record groove. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Anton Lindqvist -- MindSpring Enterprises "5 sigma is a discovery. 7 is a question." From ksantos@clari.net Tue Jun 21 04:14:18 1994 Path: ashpoly!cascade!brgate!saturno!clari!ksantos From: ksantos@clari.net (Kirsty Santos) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun21.041418.2743@clari.net> Date: Tue, 21 Jun 1994 04:14:18 GMT References: <1994Jun20.000718.5072@mindspring.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jun20.000718.5072@mindspring.com>, alindqvist@mindspring.com (Anton Lindqvist) writes: > How the 14 ASCII characters per node are encoded into the record groove. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Kirsty Santos "Do not worship the copy." Macintosh IIfx / FreeBSD 2.1 From smoreno@ox.ac.uk Wed Jun 22 05:52:18 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!smoreno From: smoreno@ox.ac.uk (Sven Moreno) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun22.055218.9209@ox.ac.uk> Date: Wed, 22 Jun 1994 05:52:18 GMT References: <1994Jun20.000718.5072@mindspring.com> <1994Jun21.041418.2743@clari.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Jun21.041418.2743@clari.net>, ksantos@clari.net (Kirsty Santos) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Sven Moreno Tape trading list upon request. SASE required for international mail. From fokonkwo@demon.co.uk Thu Jun 23 06:19:18 1994 Path: ashpoly!cascade!bigsur!demon!fokonkwo From: fokonkwo@demon.co.uk (Fiona Okonkwo) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun23.061918.8250@demon.co.uk> Date: Thu, 23 Jun 1994 06:19:18 GMT References: <1994Jun20.000718.5072@mindspring.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Jun20.000718.5072@mindspring.com>, alindqvist@mindspring.com (Anton Lindqvist) writes: > How the 14 ASCII characters per node are encoded into the record groove. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Top-posters will be placed in my ~/.killfile without notice. -- Fiona Okonkwo -- Demon Internet Services UK "When every node is whole, the channel opens."