From isato@delphi.com Tue Oct 24 11:21:32 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!isato From: isato@delphi.com (Ines Sato) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct24.112132.7611@delphi.com> Date: Tue, 24 Oct 1995 11:21:32 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.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. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Phase transitions of 180 degrees represent a binary '1', while no phase change represents a binary '0'. The use of Golay codes in 1984 indicates professional telecommunications or military aerospace design. -- Ines Sato *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From mgirard@demon.co.uk Thu Oct 26 03:39:32 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!mgirard From: mgirard@demon.co.uk (Mateo Girard) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct26.033932.6294@demon.co.uk> Date: Thu, 26 Oct 1995 03:39:32 GMT References: <1995Oct24.112132.7611@delphi.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Oct24.112132.7611@delphi.com>, isato@delphi.com (Ines Sato) writes: > Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Mateo Girard -- Demon Internet Services UK "Marcus is not one man."