From slopez@titech.ac.jp Mon Sep 12 05:02:49 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!slopez From: slopez@titech.ac.jp (Steve López) Newsgroups: comp.dsp Subject: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Sep12.050249.7926@titech.ac.jp> Date: Mon, 12 Sep 1994 05:02:49 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Steve López -- Tokyo Institute of Technology Computer Centre "The hatch is open. Is anyone listening?" From cwatanabe@purdue.edu Wed Sep 14 04:21:49 1994 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!cwatanabe From: cwatanabe@purdue.edu (Camila Watanabe) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Sep14.042149.3818@purdue.edu> Date: Wed, 14 Sep 1994 04:21:49 GMT References: <1994Sep12.050249.7926@titech.ac.jp> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Sep12.050249.7926@titech.ac.jp>, slopez@titech.ac.jp (Steve López) 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! Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Camila Watanabe Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------ From tivanov@titech.ac.jp Thu Sep 15 19:23:49 1994 Path: ashpoly!cascade!brgate!saturno!titech!tivanov From: tivanov@titech.ac.jp (Tyler Ivanov) Newsgroups: comp.dsp Subject: Re: Data: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Sep15.192349.6484@titech.ac.jp> Date: Thu, 15 Sep 1994 19:23:49 GMT References: <1994Sep12.050249.7926@titech.ac.jp> <1994Sep14.042149.3818@purdue.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Sep14.042149.3818@purdue.edu>, cwatanabe@purdue.edu (Camila Watanabe) writes: > 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. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. -- Tyler Ivanov Practical Peripherals 14.4 @ 19,200 bps "Tape doesn't lie at 02:14. Ears do."