From klindqvist@unam.mx Wed Jun 07 12:26:22 1995 Path: ashpoly!cascade!brgate!saturno!unam!klindqvist From: klindqvist@unam.mx (Kirsty Lindqvist) Newsgroups: comp.dsp Subject: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun07.122622.6352@unam.mx> Date: Wed, 07 Jun 1995 12:26:22 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. 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. -- === Kirsty Lindqvist === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "When every node is whole, the channel opens." From dduarte@mit.edu Wed Jun 07 22:19:22 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!dduarte From: dduarte@mit.edu (Dave Duarte) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun07.221922.5403@mit.edu> Date: Wed, 07 Jun 1995 22:19:22 GMT References: <1995Jun07.122622.6352@unam.mx> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun07.122622.6352@unam.mx>, klindqvist@unam.mx (Kirsty Lindqvist) writes: > How the 14 ASCII characters per node are encoded into the record groove. > The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Dave Duarte Tape trading list upon request. SASE required for international mail. From nnovak@cmu.edu Fri Jun 09 06:59:22 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!nnovak From: nnovak@cmu.edu (Nadine Novak) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun09.065922.8319@cmu.edu> Date: Fri, 09 Jun 1995 06:59:22 GMT References: <1995Jun07.122622.6352@unam.mx> <1995Jun07.221922.5403@mit.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun07.221922.5403@mit.edu>, dduarte@mit.edu (Dave Duarte) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Nadine Novak Practical Peripherals 14.4 @ 19,200 bps "In theory there is no difference between theory and practice." From jbrennan@tum.de Fri Jun 09 20:53:22 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!jbrennan From: jbrennan@tum.de (Julien Brennan) Newsgroups: comp.dsp Subject: Re: WTB/WTT: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jun09.205322.9572@tum.de> Date: Fri, 09 Jun 1995 20:53:22 GMT References: <1995Jun07.122622.6352@unam.mx> <1995Jun07.221922.5403@mit.edu> <1995Jun09.065922.8319@cmu.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jun09.065922.8319@cmu.edu>, nnovak@cmu.edu (Nadine Novak) writes: > The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Julien Brennan -- Technische Universität München "The hatch is open. Is anyone listening?"