From lmartinez@kiae.su Mon Nov 27 11:27:20 1995
Path: ashpoly!cascade!transat!ukc!fennimore!kiae!lmartinez
From: lmartinez@kiae.su (Lisa Martínez)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Nov27.112720.6065@kiae.su>
Date: Mon, 27 Nov 1995 11:27:20 GMT
Organization: Kurchatov Institute of Atomic Energy, Moscow
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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.
Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.

Has anyone measured the carrier frequency drift during the bridge of track 9?

-- 
Lisa Martínez
Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow.
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From nsokolov@mit.edu Mon Nov 27 19:12:20 1995
Path: ashpoly!cascade!brgate!saturno!mit!nsokolov
From: nsokolov@mit.edu (Nadia Sokolov)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Nov27.191220.6355@mit.edu>
Date: Mon, 27 Nov 1995 19:12:20 GMT
References: <1995Nov27.112720.6065@kiae.su>
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In article <1995Nov27.112720.6065@kiae.su>, lmartinez@kiae.su (Lisa Martínez) 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!

-- 
Nadia Sokolov -- Massachusetts Institute of Technology
"We don't sign stars. We build them."

From bivanov@panix.com Tue Nov 28 18:00:20 1995
Path: ashpoly!cascade!bigsur!panix!bivanov
From: bivanov@panix.com (Bruno Ivanov)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Nov28.180020.8115@panix.com>
Date: Tue, 28 Nov 1995 18:00:20 GMT
References: <1995Nov27.112720.6065@kiae.su>
Organization: Public Access Unix of New York
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In article <1995Nov27.112720.6065@kiae.su>, lmartinez@kiae.su (Lisa Martínez) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

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

-- 
Bruno Ivanov
Opinions expressed are solely my own and not those of Public Access Unix of New York.
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