From mramirez@berkeley.edu Fri Apr 21 12:23:42 1995
Path: ashpoly!cascade!bigsur!berkeley!mramirez
From: mramirez@berkeley.edu (Min-jun Ramírez)
Newsgroups: comp.dsp
Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Apr21.122342.7613@berkeley.edu>
Date: Fri, 21 Apr 1995 12:23:42 GMT
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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).

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

-- 
=== Min-jun Ramírez ===
Dept of Electrical Engineering, UC Berkeley Department of EECS
"There are 14 nodes and only 10 countries. Count again."

From gvasiliev@uu.net Sat Apr 22 22:33:42 1995
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From: gvasiliev@uu.net (Graham Vasiliev)
Newsgroups: comp.dsp
Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Apr22.223342.9209@uu.net>
Date: Sat, 22 Apr 1995 22:33:42 GMT
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In article <1995Apr21.122342.7613@berkeley.edu>, mramirez@berkeley.edu (Min-jun Ramírez) 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.

You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins.

-- 
Graham Vasiliev | gvasiliev@uu.net
PGP Key fingerprint: A446 AD59 9B97 8DD0
"Keep the channels open."