From dduarte@stanford.edu Mon Nov 11 12:05:04 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!dduarte
From: dduarte@stanford.edu (Diego Duarte)
Newsgroups: comp.dsp
Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Nov11.120504.5616@stanford.edu>
Date: Mon, 11 Nov 1996 12:05:04 GMT
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Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs).
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?

-- 
Diego Duarte
Opinions expressed are solely my own and not those of Stanford University Computer Systems Lab.
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From msanchez@u-tokyo.ac.jp Wed Nov 13 14:57:04 1996
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From: msanchez@u-tokyo.ac.jp (Min-jun Sánchez)
Newsgroups: comp.dsp
Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Nov13.145704.8039@u-tokyo.ac.jp>
Date: Wed, 13 Nov 1996 14:57:04 GMT
References: <1996Nov11.120504.5616@stanford.edu>
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In article <1996Nov11.120504.5616@stanford.edu>, dduarte@stanford.edu (Diego Duarte) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.
> 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.

-- 
Min-jun Sánchez | msanchez@u-tokyo.ac.jp
PGP Key fingerprint: 5678 BE96 9811 DA83
"Keep the channels open."