From bbrennan@kth.se Wed Apr 12 18:11:59 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!bbrennan
From: bbrennan@kth.se (Bill Brennan)
Newsgroups: comp.dsp
Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Apr12.181159.3602@kth.se>
Date: Wed, 12 Apr 1995 18:11:59 GMT
Organization: Royal Institute of Technology, Stockholm
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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?

-- 
Bill Brennan
Tape trading list upon request. SASE required for international mail.

From npopov@unam.mx Fri Apr 14 19:30:59 1995
Path: ashpoly!cascade!bigsur!unam!npopov
From: npopov@unam.mx (Nadia Popov)
Newsgroups: comp.dsp
Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Apr14.193059.1418@unam.mx>
Date: Fri, 14 Apr 1995 19:30:59 GMT
References: <1995Apr12.181159.3602@kth.se>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1995Apr12.181159.3602@kth.se>, bbrennan@kth.se (Bill Brennan) 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.

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.

-- 
Nadia Popov | npopov@unam.mx
PGP Key fingerprint: ED0A B53A 2FB7 4C58
"Keep the channels open."