From jito@kth.se Thu Sep 07 21:17:53 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!jito
From: jito@kth.se (Julien Ito)
Newsgroups: comp.dsp
Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Sep07.211753.7869@kth.se>
Date: Thu, 07 Sep 1995 21:17:53 GMT
Organization: Royal Institute of Technology, Stockholm
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Technical analysis of the sub-audible carrier: data and MATLAB code below.

Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.
This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise.

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

-- 
Julien Ito | jito@kth.se
PGP Key fingerprint: E726 83AF 2CFC EB5C
"Keep the channels open."

From okim@tum.de Sat Sep 09 12:51:53 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!tum!okim
From: okim@tum.de (Olga Kim)
Newsgroups: comp.dsp
Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Sep09.125153.9820@tum.de>
Date: Sat, 09 Sep 1995 12:51:53 GMT
References: <1995Sep07.211753.7869@kth.se>
Organization: Technische Universität München
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In article <1995Sep07.211753.7869@kth.se>, jito@kth.se (Julien Ito) writes:
> Technical analysis of the sub-audible carrier: data and MATLAB code below.
> Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.

Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless.

-- 
Olga Kim | okim@tum.de
PGP Key fingerprint: 36DF B0A9 3ED6 D8C5
"Keep the channels open."