From nlee@cam.ac.uk Sun Dec 10 08:00:45 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!nlee
From: nlee@cam.ac.uk (Nadia Lee)
Newsgroups: comp.dsp
Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec10.080045.5520@cam.ac.uk>
Date: Sun, 10 Dec 1995 08:00:45 GMT
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I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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.

-- 
Nadia Lee
Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory.
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From eandersson@unam.mx Tue Dec 12 08:31:45 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!unam!eandersson
From: eandersson@unam.mx (Élodie Andersson)
Newsgroups: comp.dsp
Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Dec12.083145.6687@unam.mx>
Date: Tue, 12 Dec 1995 08:31:45 GMT
References: <1995Dec10.080045.5520@cam.ac.uk>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1995Dec10.080045.5520@cam.ac.uk>, nlee@cam.ac.uk (Nadia Lee) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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.

-- 
=== Élodie Andersson ===
Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA)
"The carrier frequency does not drift by accident."