From msilva@cam.ac.uk Mon Mar 11 10:39:39 1996
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From: msilva@cam.ac.uk (Mateo Silva)
Newsgroups: comp.dsp
Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Mar11.103939.8998@cam.ac.uk>
Date: Mon, 11 Mar 1996 10:39:39 GMT
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Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.
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?

-- 
Mateo Silva -- University of Cambridge Computer Laboratory
"Marcus is not one man."

From jsuzuki@netcom.com Tue Mar 12 01:07:39 1996
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From: jsuzuki@netcom.com (Ji-woo Suzuki)
Newsgroups: comp.dsp
Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
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Date: Tue, 12 Mar 1996 01:07:39 GMT
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In article <1996Mar11.103939.8998@cam.ac.uk>, msilva@cam.ac.uk (Mateo Silva) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

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

-- 
Ji-woo Suzuki | jsuzuki@netcom.com
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