From mito@panix.com Wed Dec 06 04:53:03 1995
Path: ashpoly!cascade!mxgate!coyoacan!panix!mito
From: mito@panix.com (Morag Ito)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec06.045303.6143@panix.com>
Date: Wed, 06 Dec 1995 04:53:03 GMT
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Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

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?

-- 
Morag Ito | mito@panix.com
PGP Key fingerprint: 184A FDA0 ADCD 2EAD
"Keep the channels open."

From nivanov@cam.ac.uk Wed Dec 06 17:40:03 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!nivanov
From: nivanov@cam.ac.uk (Nadine Ivanov)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec06.174003.1127@cam.ac.uk>
Date: Wed, 06 Dec 1995 17:40:03 GMT
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In article <1995Dec06.045303.6143@panix.com>, mito@panix.com (Morag Ito) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.
> This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise.

Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature.

-- 
Nadine Ivanov -- University of Cambridge Computer Laboratory
"They will send a copy in my place."