From nivanov@inria.fr Mon Nov 06 01:10:52 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!nivanov From: nivanov@inria.fr (Nadine Ivanov) Newsgroups: comp.dsp Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov06.011052.9335@inria.fr> Date: Mon, 06 Nov 1995 01:10:52 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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'. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Nadine Ivanov -- INRIA Rocquencourt "Measuring a record you own is listening, not piracy." From asokolov@pipeline.com Tue Nov 07 19:36:52 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!asokolov From: asokolov@pipeline.com (Amy Sokolov) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov07.193652.6233@pipeline.com> Date: Tue, 07 Nov 1995 19:36:52 GMT References: <1995Nov06.011052.9335@inria.fr> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov06.011052.9335@inria.fr>, nivanov@inria.fr (Nadine Ivanov) writes: > How the 14 ASCII characters per node are encoded into the record groove. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Amy Sokolov SupraFAXModem 28.8 @ 14,400 bps "Marcus is not one man." From dweber@hanse.de Thu Nov 09 13:40:52 1995 Path: ashpoly!cascade!bigsur!hanse!dweber From: dweber@hanse.de (Dmitri Weber) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov09.134052.1168@hanse.de> Date: Thu, 09 Nov 1995 13:40:52 GMT References: <1995Nov06.011052.9335@inria.fr> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Nov06.011052.9335@inria.fr>, nivanov@inria.fr (Nadine Ivanov) 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. -- Dmitri Weber "The carrier frequency does not drift by accident." Pentium 90 (OS/2 Warp) / System 7.5.1