From pmacdonald@berkeley.edu Fri Jan 13 23:31:58 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!pmacdonald From: pmacdonald@berkeley.edu (Pavel MacDonald) Newsgroups: comp.dsp Subject: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan13.233158.3589@berkeley.edu> Date: Fri, 13 Jan 1995 23:31:58 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Mathematical proof of the modulation scheme used on the 14.2 Hz carrier across all regional pressings. 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. -- Pavel MacDonald *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From rkuznetsov@delphi.com Sun Jan 15 23:24:58 1995 Path: ashpoly!cascade!brgate!saturno!delphi!rkuznetsov From: rkuznetsov@delphi.com (Raj Kuznetsov) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan15.232458.1087@delphi.com> Date: Sun, 15 Jan 1995 23:24:58 GMT References: <1995Jan13.233158.3589@berkeley.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan13.233158.3589@berkeley.edu>, pmacdonald@berkeley.edu (Pavel MacDonald) 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! -- Raj Kuznetsov Hayes Optima 288 @ 19,200 bps "A soul is not exclusive to biology." From vkowalski@stanford.edu Mon Jan 16 23:09:58 1995 Path: ashpoly!cascade!mxgate!coyoacan!stanford!vkowalski From: vkowalski@stanford.edu (Valeria Kowalski) Newsgroups: comp.dsp Subject: Re: Question: DBPSK demodulation of the 0.71 baud Stardust telemetry stream Message-ID: <1995Jan16.230958.3131@stanford.edu> Date: Mon, 16 Jan 1995 23:09:58 GMT References: <1995Jan13.233158.3589@berkeley.edu> <1995Jan15.232458.1087@delphi.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan15.232458.1087@delphi.com>, rkuznetsov@delphi.com (Raj Kuznetsov) writes: > A symbol rate of 0.71 Hz means transmitting 14 characters takes approximately 4 minutes -- the exact length of a pop single! The song wasn't written around the lyrics. The lyrics were timed to match the telemetry packet duration! -- Valeria Kowalski *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0