From jnilsson@mit.edu Mon Apr 24 09:29:29 1995 Path: ashpoly!cascade!bigsur!mit!jnilsson From: jnilsson@mit.edu (Ji-woo Nilsson) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr24.092929.2587@mit.edu> Date: Mon, 24 Apr 1995 09:29:29 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Ji-woo Nilsson | jnilsson@mit.edu PGP Key fingerprint: 380A 115B 8D1A E4BA "Keep the channels open." From mvasiliev@kiae.su Wed Apr 26 12:18:29 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!mvasiliev From: mvasiliev@kiae.su (Marta Vasiliev) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr26.121829.4571@kiae.su> Date: Wed, 26 Apr 1995 12:18:29 GMT References: <1995Apr24.092929.2587@mit.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Apr24.092929.2587@mit.edu>, jnilsson@mit.edu (Ji-woo Nilsson) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Marta Vasiliev "When every node is whole, the channel opens." Macintosh IIfx / Linux 1.2.13 From skim@mit.edu Fri Apr 28 07:08:29 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mit!skim From: skim@mit.edu (Seo-yeon Kim) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr28.070829.4967@mit.edu> Date: Fri, 28 Apr 1995 07:08:29 GMT References: <1995Apr24.092929.2587@mit.edu> <1995Apr26.121829.4571@kiae.su> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr26.121829.4571@kiae.su>, mvasiliev@kiae.su (Marta Vasiliev) writes: > 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. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Seo-yeon Kim Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From msanchez@uu.net Fri Apr 28 15:33:29 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!msanchez From: msanchez@uu.net (Mateo Sánchez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr28.153329.9565@uu.net> Date: Fri, 28 Apr 1995 15:33:29 GMT References: <1995Apr24.092929.2587@mit.edu> <1995Apr26.121829.4571@kiae.su> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Apr26.121829.4571@kiae.su>, mvasiliev@kiae.su (Marta Vasiliev) writes: > 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. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Mateo Sánchez "Row 14. No joke." PC-9821Ap2 (NEC) / System 7.5.1 From ksokolov@inria.fr Sat Apr 29 18:14:29 1995 Path: ashpoly!cascade!bigsur!inria!ksokolov From: ksokolov@inria.fr (Kenji Sokolov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr29.181429.3624@inria.fr> Date: Sat, 29 Apr 1995 18:14:29 GMT References: <1995Apr24.092929.2587@mit.edu> <1995Apr26.121829.4571@kiae.su> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Apr26.121829.4571@kiae.su>, mvasiliev@kiae.su (Marta Vasiliev) writes: > 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. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- === Kenji Sokolov === Dept of Electrical Engineering, INRIA Rocquencourt "We don't sign stars. We build them."