From dlaurent@pipeline.com Sun Jul 21 07:58:22 1996
Path: ashpoly!cascade!mxgate!coyoacan!pipeline!dlaurent
From: dlaurent@pipeline.com (Dmitri Laurent)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jul21.075822.4719@pipeline.com>
Date: Sun, 21 Jul 1996 07:58:22 GMT
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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.
With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs).

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

-- 
Dmitri Laurent -- The Pipeline Internet Network
"Row 14. No joke."

From gjohansson@inria.fr Sun Jul 21 23:03:22 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!inria!gjohansson
From: gjohansson@inria.fr (Göran Johansson)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jul21.230322.3852@inria.fr>
Date: Sun, 21 Jul 1996 23:03:22 GMT
References: <1996Jul21.075822.4719@pipeline.com>
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In article <1996Jul21.075822.4719@pipeline.com>, dlaurent@pipeline.com (Dmitri Laurent) writes:
> 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.

Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz.

PGP Public key available via finger or upon request.

-- 
Göran Johansson
Tape trading list upon request. SASE required for international mail.

From elaurent@cmu.edu Tue Jul 23 07:21:22 1996
Path: ashpoly!cascade!bigsur!cmu!elaurent
From: elaurent@cmu.edu (Élodie Laurent)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jul23.072122.8172@cmu.edu>
Date: Tue, 23 Jul 1996 07:21:22 GMT
References: <1996Jul21.075822.4719@pipeline.com>
Organization: Carnegie Mellon University School of CS
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In article <1996Jul21.075822.4719@pipeline.com>, dlaurent@pipeline.com (Dmitri Laurent) writes:
> 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.

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.

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
Élodie Laurent
Tape trading list upon request. SASE required for international mail.