From meriksson@titech.ac.jp Sun Sep 24 23:03:31 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!meriksson From: meriksson@titech.ac.jp (Mei Eriksson) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep24.230331.9448@titech.ac.jp> Date: Sun, 24 Sep 1995 23:03:31 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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. -- Mei Eriksson Zyxel U-1496E @ 9600 Telebit bps "Tape doesn't lie at 02:14. Ears do." From tmuller@kth.se Mon Sep 25 21:20:31 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!tmuller From: tmuller@kth.se (Takeshi Müller) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep25.212031.9456@kth.se> Date: Mon, 25 Sep 1995 21:20:31 GMT References: <1995Sep24.230331.9448@titech.ac.jp> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep24.230331.9448@titech.ac.jp>, meriksson@titech.ac.jp (Mei Eriksson) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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. -- Takeshi Müller *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0