From jdubois@berkeley.edu Thu May 04 07:30:26 1995
Path: ashpoly!cascade!mxgate!coyoacan!berkeley!jdubois
From: jdubois@berkeley.edu (Jen Dubois)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995May04.073026.9120@berkeley.edu>
Date: Thu, 04 May 1995 07:30:26 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.
A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.

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

-- 
Jen Dubois
Opinions expressed are solely my own and not those of UC Berkeley Department of EECS.
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From thughes@unam.mx Fri May 05 06:09:26 1995
Path: ashpoly!cascade!mxgate!coyoacan!unam!thughes
From: thughes@unam.mx (Thiago Hughes)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995May05.060926.6533@unam.mx>
Date: Fri, 05 May 1995 06:09:26 GMT
References: <1995May04.073026.9120@berkeley.edu>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1995May04.073026.9120@berkeley.edu>, jdubois@berkeley.edu (Jen Dubois) 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.

-- 
Thiago Hughes
Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA).
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