From dlarsson@pipeline.com Sun Nov 12 17:32:36 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!dlarsson From: dlarsson@pipeline.com (Diego Larsson) Newsgroups: comp.dsp Subject: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov12.173236.4958@pipeline.com> Date: Sun, 12 Nov 1995 17:32:36 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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. The symbol duration is exactly 1.408 seconds, corresponding to a symbol rate of 0.7107 baud (14.2 Hz / 20). Has anyone encountered bit errors in their decoded text? The Golay decoder corrects up to 3 bit errors per 24-bit codeword. -- === Diego Larsson === Dept of Electrical Engineering, The Pipeline Internet Network "5 sigma is a discovery. 7 is a question." From tnilsson@rwth-aachen.de Sun Nov 12 19:13:36 1995 Path: ashpoly!cascade!brgate!saturno!rwth-aachen!tnilsson From: tnilsson@rwth-aachen.de (Takeshi Nilsson) Newsgroups: comp.dsp Subject: Re: [FLAME] DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Nov12.191336.1112@rwth-aachen.de> Date: Sun, 12 Nov 1995 19:13:36 GMT References: <1995Nov12.173236.4958@pipeline.com> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Nov12.173236.4958@pipeline.com>, dlarsson@pipeline.com (Diego Larsson) writes: > 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. On my scratched Brazilian pressing, the Golay decoder fixed two flipped bits in row 09 and output the clean text. Top-posters will be placed in my ~/.killfile without notice. -- Takeshi Nilsson US Robotics Courier V.34 @ 14,400 bps "Measuring a record you own is listening, not piracy."