From mramirez@stanford.edu Fri Jul 28 18:14:20 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!stanford!mramirez
From: mramirez@stanford.edu (Morag Ramírez)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jul28.181420.9599@stanford.edu>
Date: Fri, 28 Jul 1995 18:14:20 GMT
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Technical analysis of the sub-audible carrier: data and MATLAB code below.

This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise.
With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs).

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

-- 
Morag Ramírez
Tape trading list upon request. SASE required for international mail.

From osantos@clari.net Sun Jul 30 04:23:20 1995
Path: ashpoly!cascade!bigsur!clari!osantos
From: osantos@clari.net (Olga Santos)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jul30.042320.8742@clari.net>
Date: Sun, 30 Jul 1995 04:23:20 GMT
References: <1995Jul28.181420.9599@stanford.edu>
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In article <1995Jul28.181420.9599@stanford.edu>, mramirez@stanford.edu (Morag Ramírez) writes:
> Technical analysis of the sub-audible carrier: data and MATLAB code below.

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.

-- 
Olga Santos -- ClariNet Communications Corp
"They will send a copy in my place."