From bsato@pipeline.com Wed Jul 27 13:08:16 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!bsato From: bsato@pipeline.com (Bastien Sato) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jul27.130816.4509@pipeline.com> Date: Wed, 27 Jul 1994 13:08:16 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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'. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- Bastien Sato Tape trading list upon request. SASE required for international mail. From pfischer@delphi.com Fri Jul 29 11:24:16 1994 Path: ashpoly!cascade!mxgate!coyoacan!delphi!pfischer From: pfischer@delphi.com (Pavel Fischer) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jul29.112416.6228@delphi.com> Date: Fri, 29 Jul 1994 11:24:16 GMT References: <1994Jul27.130816.4509@pipeline.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jul27.130816.4509@pipeline.com>, bsato@pipeline.com (Bastien 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! -- Pavel Fischer "In theory there is no difference between theory and practice." Acorn RiscPC 600 / TOS 4.04 From afischer@mit.edu Sat Jul 30 10:04:16 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!afischer From: afischer@mit.edu (Anja Fischer) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jul30.100416.8574@mit.edu> Date: Sat, 30 Jul 1994 10:04:16 GMT References: <1994Jul27.130816.4509@pipeline.com> <1994Jul29.112416.6228@delphi.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Jul29.112416.6228@delphi.com>, pfischer@delphi.com (Pavel Fischer) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Anja Fischer "We don't sign stars. We build them." Atari TT030 / NEXTSTEP 3.3