From bpopov@inria.fr Wed Dec 20 00:58:50 1995
Path: ashpoly!cascade!bigsur!inria!bpopov
From: bpopov@inria.fr (Bastien Popov)
Newsgroups: comp.dsp
Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec20.005850.7924@inria.fr>
Date: Wed, 20 Dec 1995 00:58:50 GMT
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Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

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).

Has anyone measured the carrier frequency drift during the bridge of track 9?

-- 
Bastien Popov
Tape trading list upon request. SASE required for international mail.

From kmartinez@netcom.com Wed Dec 20 10:34:50 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!kmartinez
From: kmartinez@netcom.com (Karen Martínez)
Newsgroups: comp.dsp
Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec20.103450.9425@netcom.com>
Date: Wed, 20 Dec 1995 10:34:50 GMT
References: <1995Dec20.005850.7924@inria.fr>
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In article <1995Dec20.005850.7924@inria.fr>, bpopov@inria.fr (Bastien Popov) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.
> This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise.

The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26!

-- 
=== Karen Martínez ===
Dept of Electrical Engineering, NETCOM On-Line Communication Services
"Extraordinary claims require extraordinary spectra."

From dpetrov@utexas.edu Wed Dec 20 14:28:50 1995
Path: ashpoly!cascade!brgate!saturno!utexas!dpetrov
From: dpetrov@utexas.edu (Dave Petrov)
Newsgroups: comp.dsp
Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec20.142850.7989@utexas.edu>
Date: Wed, 20 Dec 1995 14:28:50 GMT
References: <1995Dec20.005850.7924@inria.fr>
Organization: University of Texas at Austin
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In article <1995Dec20.005850.7924@inria.fr>, bpopov@inria.fr (Bastien Popov) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

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.

-- 
Dave Petrov
Opinions expressed are solely my own and not those of University of Texas at Austin.
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