From msouza@demon.co.uk Thu Jan 06 17:04:03 1994 Path: ashpoly!cascade!mxgate!coyoacan!demon!msouza From: msouza@demon.co.uk (Mathieu Souza) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan06.170403.2385@demon.co.uk> Date: Thu, 06 Jan 1994 17:04:03 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Mathieu Souza *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From tnakamura@mindspring.com Fri Jan 07 13:58:03 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!tnakamura From: tnakamura@mindspring.com (Thiago Nakamura) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan07.135803.4711@mindspring.com> Date: Fri, 07 Jan 1994 13:58:03 GMT References: <1994Jan06.170403.2385@demon.co.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jan06.170403.2385@demon.co.uk>, msouza@demon.co.uk (Mathieu Souza) writes: > How the 14 ASCII characters per node are encoded into the record groove. > Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Thiago Nakamura "There are 14 nodes and only 10 countries. Count again." Commodore Amiga 500 (1MB OCS) / SunOS 4.1.4