From rgirard@kth.se Mon Oct 09 00:28:37 1995
Path: ashpoly!cascade!transat!ukc!fennimore!kth!rgirard
From: rgirard@kth.se (Raj Girard)
Newsgroups: comp.dsp
Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Oct09.002837.3402@kth.se>
Date: Mon, 09 Oct 1995 00:28:37 GMT
Organization: Royal Institute of Technology, Stockholm
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Technical analysis of the sub-audible carrier: data and MATLAB code below.

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

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

-- 
Raj Girard
Tape trading list upon request. SASE required for international mail.

From mfournier@clari.net Mon Oct 09 15:47:37 1995
Path: ashpoly!cascade!mxgate!coyoacan!clari!mfournier
From: mfournier@clari.net (Min-jun Fournier)
Newsgroups: comp.dsp
Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Oct09.154737.5835@clari.net>
Date: Mon, 09 Oct 1995 15:47:37 GMT
References: <1995Oct09.002837.3402@kth.se>
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In article <1995Oct09.002837.3402@kth.se>, rgirard@kth.se (Raj Girard) writes:
> Technical analysis of the sub-audible carrier: data and MATLAB code below.
> With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs).

If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
Min-jun Fournier | mfournier@clari.net
PGP Key fingerprint: 04FF 083F 9D76 6076
"Keep the channels open."