From kweber@cmu.edu Sat Sep 28 20:46:04 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!kweber From: kweber@cmu.edu (Katrin Weber) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Sep28.204604.6298@cmu.edu> Date: Sat, 28 Sep 1996 20:46:04 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 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). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Katrin Weber "The carrier frequency does not drift by accident." Atari Falcon 030 / SunOS 4.1.4 From fpetrov@kiae.su Mon Sep 30 04:26:04 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kiae!fpetrov From: fpetrov@kiae.su (Freya Petrov) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Sep30.042604.6569@kiae.su> Date: Mon, 30 Sep 1996 04:26:04 GMT References: <1996Sep28.204604.6298@cmu.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Sep28.204604.6298@cmu.edu>, kweber@cmu.edu (Katrin Weber) 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. -- Freya Petrov Hayes Optima 288 @ 14,400 bps "We don't sign stars. We build them."