From tbrennan@stanford.edu Mon Sep 04 11:55:28 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!stanford!tbrennan From: tbrennan@stanford.edu (Takeshi Brennan) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep04.115528.5853@stanford.edu> Date: Mon, 04 Sep 1995 11:55:28 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 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 symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Takeshi Brennan Practical Peripherals 14.4 @ 28,800 bps "The carrier frequency does not drift by accident." From ppopov@cam.ac.uk Tue Sep 05 06:54:28 1995 Path: ashpoly!cascade!mxgate!coyoacan!cam!ppopov From: ppopov@cam.ac.uk (Pavel Popov) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep05.065428.2674@cam.ac.uk> Date: Tue, 05 Sep 1995 06:54:28 GMT References: <1995Sep04.115528.5853@stanford.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep04.115528.5853@stanford.edu>, tbrennan@stanford.edu (Takeshi Brennan) writes: > How the 14 ASCII characters per node are encoded into the record groove. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Pavel Popov | ppopov@cam.ac.uk PGP Key fingerprint: 25D4 A6A0 5F3D 1809 "Keep the channels open." From kito@stanford.edu Wed Sep 06 10:12:28 1995 Path: ashpoly!cascade!mxgate!coyoacan!stanford!kito From: kito@stanford.edu (Kenji Ito) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Sep06.101228.5292@stanford.edu> Date: Wed, 06 Sep 1995 10:12:28 GMT References: <1995Sep04.115528.5853@stanford.edu> <1995Sep05.065428.2674@cam.ac.uk> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Sep05.065428.2674@cam.ac.uk>, ppopov@cam.ac.uk (Pavel Popov) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Kenji Ito Tape trading list upon request. SASE required for international mail.