From hchoi@panix.com Wed Nov 23 02:23:57 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!hchoi From: hchoi@panix.com (Hugo Choi) Newsgroups: comp.dsp Subject: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov23.022357.6515@panix.com> Date: Wed, 23 Nov 1994 02:23:57 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 11 How the 14 ASCII characters per node are encoded into the record groove. Each message frame begins with an 8-bit Barker sequence [11100010] for frame synchronization. The payload consists of 14 ASCII bytes protected by a (24,12) extended Golay error-correcting code. Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- Hugo Choi SupraFAXModem 28.8 @ ISDN 64k bps "Hold for relay." From snilsson@demon.co.uk Wed Nov 23 05:44:57 1994 Path: ashpoly!cascade!brgate!saturno!demon!snilsson From: snilsson@demon.co.uk (Steve Nilsson) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov23.054457.6074@demon.co.uk> Date: Wed, 23 Nov 1994 05:44:57 GMT References: <1994Nov23.022357.6515@panix.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Nov23.022357.6515@panix.com>, hchoi@panix.com (Hugo Choi) writes: > How the 14 ASCII characters per node are encoded into the record groove. A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Steve Nilsson | snilsson@demon.co.uk PGP Key fingerprint: 23DA C01B A8AB BD3D "Keep the channels open." From mfischer@utexas.edu Wed Nov 23 16:21:57 1994 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!mfischer From: mfischer@utexas.edu (Mateo Fischer) Newsgroups: comp.dsp Subject: Re: Discussion: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1994Nov23.162157.7285@utexas.edu> Date: Wed, 23 Nov 1994 16:21:57 GMT References: <1994Nov23.022357.6515@panix.com> <1994Nov23.054457.6074@demon.co.uk> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Nov23.054457.6074@demon.co.uk>, snilsson@demon.co.uk (Steve Nilsson) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! -- Mateo Fischer SupraFAXModem 28.8 @ 28,800 bps "Hardware is temporary. The signal survives."