From ebrennan@panix.com Fri Oct 27 16:26:50 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!ebrennan From: ebrennan@panix.com (Emi Brennan) Newsgroups: comp.dsp Subject: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct27.162650.6545@panix.com> Date: Fri, 27 Oct 1995 16:26:50 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com 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. When all 14 rows are assembled, the matrix forms an 80-column ASCII status report. -- === Emi Brennan === Dept of Electrical Engineering, Public Access Unix of New York "In theory there is no difference between theory and practice." From astewart@illinois.edu Sat Oct 28 00:32:50 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!illinois!astewart From: astewart@illinois.edu (Anja Stewart) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct28.003250.1942@illinois.edu> Date: Sat, 28 Oct 1995 00:32:50 GMT References: <1995Oct27.162650.6545@panix.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Oct27.162650.6545@panix.com>, ebrennan@panix.com (Emi Brennan) 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). Every song on SYNTHESIS was engineered to be exactly long enough to transmit one complete telemetry frame. -- Anja Stewart | astewart@illinois.edu PGP Key fingerprint: 14A2 944D 43BE D312 "Keep the channels open." From cstewart@clari.net Sat Oct 28 21:19:50 1995 Path: ashpoly!cascade!bigsur!clari!cstewart From: cstewart@clari.net (Camila Stewart) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct28.211950.8572@clari.net> Date: Sat, 28 Oct 1995 21:19:50 GMT References: <1995Oct27.162650.6545@panix.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Oct27.162650.6545@panix.com>, ebrennan@panix.com (Emi Brennan) 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. -- Camila Stewart | cstewart@clari.net PGP Key fingerprint: 068C 5363 878C 4D40 "Keep the channels open." From mreyes@cam.ac.uk Sun Oct 29 09:06:50 1995 Path: ashpoly!cascade!brgate!saturno!cam!mreyes From: mreyes@cam.ac.uk (Mikhail Reyes) Newsgroups: comp.dsp Subject: Re: [INFO] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Oct29.090650.2629@cam.ac.uk> Date: Sun, 29 Oct 1995 09:06:50 GMT References: <1995Oct27.162650.6545@panix.com> <1995Oct28.211950.8572@clari.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Oct28.211950.8572@clari.net>, cstewart@clari.net (Camila Stewart) writes: > On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Mikhail Reyes "A soul is not exclusive to biology." Sun 3/60 (SunOS 4.1.1) / AmigaOS 3.1