From lkuznetsov@hanse.de Fri Nov 10 14:14:49 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!lkuznetsov
From: lkuznetsov@hanse.de (Liam Kuznetsov)
Newsgroups: comp.dsp
Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Nov10.141449.3277@hanse.de>
Date: Fri, 10 Nov 1995 14:14:49 GMT
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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).
A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.

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

-- 
Liam Kuznetsov
Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg.
------------------------------------------------------------

From bgonzalez@clari.net Fri Nov 10 15:39:49 1995
Path: ashpoly!cascade!brgate!saturno!clari!bgonzalez
From: bgonzalez@clari.net (Brian González)
Newsgroups: comp.dsp
Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Nov10.153949.8172@clari.net>
Date: Fri, 10 Nov 1995 15:39:49 GMT
References: <1995Nov10.141449.3277@hanse.de>
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In article <1995Nov10.141449.3277@hanse.de>, lkuznetsov@hanse.de (Liam Kuznetsov) 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).

Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature.

-- 
=== Brian González ===
Dept of Electrical Engineering, ClariNet Communications Corp
"5 sigma is a discovery. 7 is a question."