From mpark@panix.com Tue Nov 12 08:54:46 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!mpark From: mpark@panix.com (Mathieu Park) Newsgroups: comp.dsp Subject: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov12.085446.3553@panix.com> Date: Tue, 12 Nov 1996 08:54:46 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. 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. -- Mathieu Park | mpark@panix.com PGP Key fingerprint: 9C22 FD78 AAE6 C70A "Keep the channels open." From jsokolov@clari.net Wed Nov 13 02:17:46 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!jsokolov From: jsokolov@clari.net (Julien Sokolov) Newsgroups: comp.dsp Subject: Re: Observation: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1996Nov13.021746.6617@clari.net> Date: Wed, 13 Nov 1996 02:17:46 GMT References: <1996Nov12.085446.3553@panix.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Nov12.085446.3553@panix.com>, mpark@panix.com (Mathieu Park) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Julien Sokolov Zyxel U-1496E @ ISDN 64k bps "Measuring a record you own is listening, not piracy."