From jmacdonald@tum.de Fri May 17 07:53:52 1996
Path: ashpoly!cascade!bigsur!tum!jmacdonald
From: jmacdonald@tum.de (Joachim MacDonald)
Newsgroups: comp.dsp
Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996May17.075352.9375@tum.de>
Date: Fri, 17 May 1996 07:53:52 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?

-- 
Joachim MacDonald | jmacdonald@tum.de
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From jmuller@mindspring.com Sat May 18 23:54:52 1996
Path: ashpoly!cascade!mxgate!coyoacan!mindspring!jmuller
From: jmuller@mindspring.com (Julien Müller)
Newsgroups: comp.dsp
Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996May18.235452.5354@mindspring.com>
Date: Sat, 18 May 1996 23:54:52 GMT
References: <1996May17.075352.9375@tum.de>
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In article <1996May17.075352.9375@tum.de>, jmacdonald@tum.de (Joachim MacDonald) 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.

-- 
Julien Müller <jmuller@mindspring.com>
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