From cokonkwo@demon.co.uk Sat Dec 02 15:45:21 1995 Path: ashpoly!cascade!mxgate!coyoacan!demon!cokonkwo From: cokonkwo@demon.co.uk (Callum Okonkwo) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec02.154521.2489@demon.co.uk> Date: Sat, 02 Dec 1995 15:45:21 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N 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'. 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. -- Callum Okonkwo Practical Peripherals 14.4 @ 28,800 bps "Tape doesn't lie at 02:14. Ears do." From neriksson@rwth-aachen.de Sat Dec 02 16:51:21 1995 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!neriksson From: neriksson@rwth-aachen.de (Nadia Eriksson) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec02.165121.7074@rwth-aachen.de> Date: Sat, 02 Dec 1995 16:51:21 GMT References: <1995Dec02.154521.2489@demon.co.uk> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Dec02.154521.2489@demon.co.uk>, cokonkwo@demon.co.uk (Callum Okonkwo) 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'. Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Nadia Eriksson Tape trading list upon request. SASE required for international mail. From vmoreno@illinois.edu Sun Dec 03 23:11:21 1995 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!vmoreno From: vmoreno@illinois.edu (Valeria Moreno) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec03.231121.4324@illinois.edu> Date: Sun, 03 Dec 1995 23:11:21 GMT References: <1995Dec02.154521.2489@demon.co.uk> <1995Dec02.165121.7074@rwth-aachen.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec02.165121.7074@rwth-aachen.de>, neriksson@rwth-aachen.de (Nadia Eriksson) writes: > Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- === Valeria Moreno === Dept of Electrical Engineering, University of Illinois Urbana-Champaign "Marcus is not one man." From jwatanabe@uni-hamburg.de Mon Dec 04 15:33:21 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!jwatanabe From: jwatanabe@uni-hamburg.de (Joachim Watanabe) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec04.153321.2753@uni-hamburg.de> Date: Mon, 04 Dec 1995 15:33:21 GMT References: <1995Dec02.154521.2489@demon.co.uk> <1995Dec02.165121.7074@rwth-aachen.de> <1995Dec03.231121.4324@illinois.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec03.231121.4324@illinois.edu>, vmoreno@illinois.edu (Valeria Moreno) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The Golay code confirms Marcus Hale's military background. The Voyager spacecraft and NATO satcom systems use the exact same code. -- Joachim Watanabe "The carrier frequency does not drift by accident." Sun 3/60 (SunOS 4.1.1) / NEXTSTEP 3.3 From klindqvist@mit.edu Wed Dec 06 19:02:21 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!klindqvist From: klindqvist@mit.edu (Katrin Lindqvist) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Dec06.190221.3814@mit.edu> Date: Wed, 06 Dec 1995 19:02:21 GMT References: <1995Dec02.154521.2489@demon.co.uk> <1995Dec02.165121.7074@rwth-aachen.de> <1995Dec03.231121.4324@illinois.edu> <1995Dec04.153321.2753@uni-hamburg.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Dec04.153321.2753@uni-hamburg.de>, jwatanabe@uni-hamburg.de (Joachim Watanabe) 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. -- Katrin Lindqvist Hayes Optima 288 @ 9600 Telebit bps "When every node is whole, the channel opens."