From tsmirnov@inria.fr Tue Jan 09 00:47:38 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!tsmirnov
From: tsmirnov@inria.fr (Takeshi Smirnov)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jan09.004738.7453@inria.fr>
Date: Tue, 09 Jan 1996 00:47:38 GMT
Organization: INRIA Rocquencourt
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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?

-- 
Takeshi Smirnov
Tape trading list upon request. SASE required for international mail.

From hfournier@inria.fr Wed Jan 10 00:59:38 1996
Path: ashpoly!cascade!bigsur!inria!hfournier
From: hfournier@inria.fr (Heather Fournier)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jan10.005938.1001@inria.fr>
Date: Wed, 10 Jan 1996 00:59:38 GMT
References: <1996Jan09.004738.7453@inria.fr>
Organization: INRIA Rocquencourt
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In article <1996Jan09.004738.7453@inria.fr>, tsmirnov@inria.fr (Takeshi Smirnov) writes:
> Technical analysis of the sub-audible carrier: data and MATLAB code below.

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.

-- 
Heather Fournier -- INRIA Rocquencourt
"They will send a copy in my place."