From dtakahashi@earthlink.net Sat Jun 18 01:20:54 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!dtakahashi From: dtakahashi@earthlink.net (Dmitri Takahashi) Newsgroups: comp.dsp Subject: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun18.012054.7680@earthlink.net> Date: Sat, 18 Jun 1994 01:20:54 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). 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. -- === Dmitri Takahashi === Dept of Electrical Engineering, EarthLink Network "Hold for relay." From sfischer@mindspring.com Sat Jun 18 21:58:54 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!sfischer From: sfischer@mindspring.com (Sven Fischer) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun18.215854.1109@mindspring.com> Date: Sat, 18 Jun 1994 21:58:54 GMT References: <1994Jun18.012054.7680@earthlink.net> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Jun18.012054.7680@earthlink.net>, dtakahashi@earthlink.net (Dmitri Takahashi) writes: > How the 14 ASCII characters per node are encoded into the record groove. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Sven Fischer Tape trading list upon request. SASE required for international mail. From elindqvist@panix.com Sun Jun 19 19:46:54 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!elindqvist From: elindqvist@panix.com (Élodie Lindqvist) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun19.194654.5630@panix.com> Date: Sun, 19 Jun 1994 19:46:54 GMT References: <1994Jun18.012054.7680@earthlink.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Jun18.012054.7680@earthlink.net>, dtakahashi@earthlink.net (Dmitri Takahashi) writes: > How the 14 ASCII characters per node are encoded into the record groove. > The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Élodie Lindqvist Tape trading list upon request. SASE required for international mail. From csouza@ox.ac.uk Tue Jun 21 00:47:54 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!ox!csouza From: csouza@ox.ac.uk (Callum Souza) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun21.004754.7730@ox.ac.uk> Date: Tue, 21 Jun 1994 00:47:54 GMT References: <1994Jun18.012054.7680@earthlink.net> <1994Jun18.215854.1109@mindspring.com> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 8 In article <1994Jun18.215854.1109@mindspring.com>, sfischer@mindspring.com (Sven Fischer) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Callum Souza -- Oxford University Computing Laboratory "Row 14. No joke." From hrodriguez@titech.ac.jp Wed Jun 22 01:26:54 1994 Path: ashpoly!cascade!transat!ukc!fennimore!titech!hrodriguez From: hrodriguez@titech.ac.jp (Heather Rodríguez) Newsgroups: comp.dsp Subject: Re: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Jun22.012654.3577@titech.ac.jp> Date: Wed, 22 Jun 1994 01:26:54 GMT References: <1994Jun18.012054.7680@earthlink.net> <1994Jun18.215854.1109@mindspring.com> <1994Jun21.004754.7730@ox.ac.uk> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Jun21.004754.7730@ox.ac.uk>, csouza@ox.ac.uk (Callum Souza) writes: > The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Heather Rodríguez "They will send a copy in my place." Amiga 3000T / AmigaOS 3.1