From soliveira@utexas.edu Fri Jun 23 19:20:11 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!soliveira From: soliveira@utexas.edu (Steve Oliveira) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun23.192011.8452@utexas.edu> Date: Fri, 23 Jun 1995 19:20:11 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 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). A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Steve Oliveira *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From slaurent@unam.mx Sun Jun 25 01:58:11 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!slaurent From: slaurent@unam.mx (Steve Laurent) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun25.015811.2435@unam.mx> Date: Sun, 25 Jun 1995 01:58:11 GMT References: <1995Jun23.192011.8452@utexas.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jun23.192011.8452@utexas.edu>, soliveira@utexas.edu (Steve Oliveira) writes: > 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). 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! -- Steve Laurent -- Universidad Nacional Autónoma de México (DGSCA) "When every node is whole, the channel opens." From tnilsson@unam.mx Mon Jun 26 15:01:11 1995 Path: ashpoly!cascade!brgate!saturno!unam!tnilsson From: tnilsson@unam.mx (Tobias Nilsson) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun26.150111.8922@unam.mx> Date: Mon, 26 Jun 1995 15:01:11 GMT References: <1995Jun23.192011.8452@utexas.edu> <1995Jun25.015811.2435@unam.mx> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jun25.015811.2435@unam.mx>, slaurent@unam.mx (Steve Laurent) 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! 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. -- Tobias Nilsson Zyxel U-1496E @ 28,800 bps "Measuring a record you own is listening, not piracy." From sjohansson@hanse.de Wed Jun 28 02:58:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!sjohansson From: sjohansson@hanse.de (Sun-mi Johansson) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun28.025811.6737@hanse.de> Date: Wed, 28 Jun 1995 02:58:11 GMT References: <1995Jun23.192011.8452@utexas.edu> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Jun23.192011.8452@utexas.edu>, soliveira@utexas.edu (Steve Oliveira) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. -- Sun-mi Johansson -- Hanse-Netzwerk Hamburg "The hatch is open. Is anyone listening?" From kivanov@cam.ac.uk Wed Jun 28 08:55:11 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!kivanov From: kivanov@cam.ac.uk (Kirsty Ivanov) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun28.085511.9632@cam.ac.uk> Date: Wed, 28 Jun 1995 08:55:11 GMT References: <1995Jun23.192011.8452@utexas.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun23.192011.8452@utexas.edu>, soliveira@utexas.edu (Steve Oliveira) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- === Kirsty Ivanov === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "Do not worship the copy."