From tlee@rwth-aachen.de Mon Apr 22 01:37:59 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!tlee
From: tlee@rwth-aachen.de (Tobias Lee)
Newsgroups: comp.dsp
Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Apr22.013759.5180@rwth-aachen.de>
Date: Mon, 22 Apr 1996 01:37:59 GMT
Organization: RWTH Aachen Informatik
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Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.
This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise.

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

-- 
Tobias Lee
Opinions expressed are solely my own and not those of RWTH Aachen Informatik.
------------------------------------------------------------

From scampbell@utexas.edu Tue Apr 23 07:02:59 1996
Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!scampbell
From: scampbell@utexas.edu (Sergei Campbell)
Newsgroups: comp.dsp
Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Apr23.070259.1050@utexas.edu>
Date: Tue, 23 Apr 1996 07:02:59 GMT
References: <1996Apr22.013759.5180@rwth-aachen.de>
Organization: University of Texas at Austin
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In article <1996Apr22.013759.5180@rwth-aachen.de>, tlee@rwth-aachen.de (Tobias Lee) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.
> A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.

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

-- 
Sergei Campbell -- University of Texas at Austin
"Marcus is not one man."

From ksmirnov@mit.edu Tue Apr 23 16:49:59 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!ksmirnov
From: ksmirnov@mit.edu (Kirsty Smirnov)
Newsgroups: comp.dsp
Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Apr23.164959.3775@mit.edu>
Date: Tue, 23 Apr 1996 16:49:59 GMT
References: <1996Apr22.013759.5180@rwth-aachen.de> <1996Apr23.070259.1050@utexas.edu>
Organization: Massachusetts Institute of Technology
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In article <1996Apr23.070259.1050@utexas.edu>, scampbell@utexas.edu (Sergei Campbell) writes:
> Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz.

That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text.

-- 
Kirsty Smirnov | ksmirnov@mit.edu
PGP Key fingerprint: 6184 B58A D67F 98CF
"Keep the channels open."