From mkuznetsov@pacbell.net Thu Feb 09 04:19:46 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!mkuznetsov
From: mkuznetsov@pacbell.net (Mateo Kuznetsov)
Newsgroups: comp.dsp
Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Feb09.041946.4576@pacbell.net>
Date: Thu, 09 Feb 1995 04:19:46 GMT
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Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs).
Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.

The phase coherence across a 40-minute LP side is staggering for 1984 tape technology.

-- 
Mateo Kuznetsov
Tape trading list upon request. SASE required for international mail.

From aduarte@utexas.edu Sat Feb 11 02:48:46 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!aduarte
From: aduarte@utexas.edu (Andrei Duarte)
Newsgroups: comp.dsp
Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
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Date: Sat, 11 Feb 1995 02:48:46 GMT
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In article <1995Feb09.041946.4576@pacbell.net>, mkuznetsov@pacbell.net (Mateo Kuznetsov) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26!

-- 
=== Andrei Duarte ===
Dept of Electrical Engineering, University of Texas at Austin
"In theory there is no difference between theory and practice."