From hschneider@unam.mx Sat Jun 10 23:29:19 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!unam!hschneider
From: hschneider@unam.mx (Hugo Schneider)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jun10.232919.9279@unam.mx>
Date: Sat, 10 Jun 1995 23:29:19 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.
A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.

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

-- 
Hugo Schneider | hschneider@unam.mx
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"Keep the channels open."

From kivanov@pacbell.net Mon Jun 12 01:01:19 1995
Path: ashpoly!cascade!brgate!saturno!pacbell!kivanov
From: kivanov@pacbell.net (Kirsty Ivanov)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jun12.010119.2733@pacbell.net>
Date: Mon, 12 Jun 1995 01:01:19 GMT
References: <1995Jun10.232919.9279@unam.mx>
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In article <1995Jun10.232919.9279@unam.mx>, hschneider@unam.mx (Hugo Schneider) 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.

Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock.

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
=== Kirsty Ivanov ===
Dept of Electrical Engineering, Pacific Bell Internet Services
"Marcus is not one man."