From omacdonald@tum.de Sat Feb 18 01:20:57 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!omacdonald
From: omacdonald@tum.de (Olga MacDonald)
Newsgroups: comp.dsp
Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Feb18.012057.7842@tum.de>
Date: Sat, 18 Feb 1995 01:20:57 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).

I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu.

-- 
Olga MacDonald | omacdonald@tum.de
PGP Key fingerprint: A642 EAF1 090E 9B88
"Keep the channels open."

From rbrennan@kth.se Mon Feb 20 00:24:57 1995
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From: rbrennan@kth.se (Renata Brennan)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Feb20.002457.7816@kth.se>
Date: Mon, 20 Feb 1995 00:24:57 GMT
References: <1995Feb18.012057.7842@tum.de>
Organization: Royal Institute of Technology, Stockholm
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In article <1995Feb18.012057.7842@tum.de>, omacdonald@tum.de (Olga MacDonald) 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.

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

-- 
Renata Brennan
Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm.
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