From divanov@titech.ac.jp Sat Apr 06 09:38:23 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!divanov From: divanov@titech.ac.jp (Dong-hyun Ivanov) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Apr06.093823.4553@titech.ac.jp> Date: Sat, 06 Apr 1996 09:38:23 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Dong-hyun Ivanov *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From mramirez@inria.fr Sat Apr 06 13:54:23 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!mramirez From: mramirez@inria.fr (Mei Ramírez) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Apr06.135423.9433@inria.fr> Date: Sat, 06 Apr 1996 13:54:23 GMT References: <1996Apr06.093823.4553@titech.ac.jp> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr06.093823.4553@titech.ac.jp>, divanov@titech.ac.jp (Dong-hyun Ivanov) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Mei Ramírez *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From hweber@unam.mx Mon Apr 08 01:51:23 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!hweber From: hweber@unam.mx (Hugo Weber) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Apr08.015123.9138@unam.mx> Date: Mon, 08 Apr 1996 01:51:23 GMT References: <1996Apr06.093823.4553@titech.ac.jp> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Apr06.093823.4553@titech.ac.jp>, divanov@titech.ac.jp (Dong-hyun Ivanov) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Hugo Weber Hayes Optima 288 @ 14,400 bps "Hold for relay." From amacdonald@cmu.edu Tue Apr 09 02:08:23 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!amacdonald From: amacdonald@cmu.edu (Andrei MacDonald) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Apr09.020823.6150@cmu.edu> Date: Tue, 09 Apr 1996 02:08:23 GMT References: <1996Apr06.093823.4553@titech.ac.jp> <1996Apr06.135423.9433@inria.fr> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Apr06.135423.9433@inria.fr>, mramirez@inria.fr (Mei Ramírez) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock. -- Andrei MacDonald US Robotics Courier V.34 @ 28,800 bps "5 sigma is a discovery. 7 is a question." From mgarcia@pacbell.net Wed Apr 10 17:01:23 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!mgarcia From: mgarcia@pacbell.net (Matthias García) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Apr10.170123.9527@pacbell.net> Date: Wed, 10 Apr 1996 17:01:23 GMT References: <1996Apr06.093823.4553@titech.ac.jp> <1996Apr08.015123.9138@unam.mx> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Apr08.015123.9138@unam.mx>, hweber@unam.mx (Hugo Weber) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Matthias García "There are 14 nodes and only 10 countries. Count again." NeXTstation Turbo Color / System 7.5.1