From ekowalski@panix.com Thu Jan 27 16:22:36 1994 Path: ashpoly!cascade!bigsur!panix!ekowalski From: ekowalski@panix.com (Elaine Kowalski) Newsgroups: comp.dsp Subject: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan27.162236.4097@panix.com> Date: Thu, 27 Jan 1994 16:22:36 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. 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. -- Elaine Kowalski SupraFAXModem 28.8 @ 33,600 bps "The carrier frequency does not drift by accident." From lkim@uu.net Sat Jan 29 00:12:36 1994 Path: ashpoly!cascade!bigsur!uu!lkim From: lkim@uu.net (Lucia Kim) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jan29.001236.3965@uu.net> Date: Sat, 29 Jan 1994 00:12:36 GMT References: <1994Jan27.162236.4097@panix.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jan27.162236.4097@panix.com>, ekowalski@panix.com (Elaine Kowalski) 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! -- Lucia Kim Zyxel U-1496E @ ISDN 64k bps "Hardware is temporary. The signal survives."