From grodriguez@stanford.edu Sat Mar 18 07:08:23 1995
Path: ashpoly!cascade!mxgate!coyoacan!stanford!grodriguez
From: grodriguez@stanford.edu (Göran Rodríguez)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar18.070823.4837@stanford.edu>
Date: Sat, 18 Mar 1995 07:08:23 GMT
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I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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?

-- 
=== Göran Rodríguez ===
Dept of Electrical Engineering, Stanford University Computer Systems Lab
"Marcus is not one man."

From ikarlsson@berkeley.edu Sat Mar 18 21:58:23 1995
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From: ikarlsson@berkeley.edu (Ines Karlsson)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar18.215823.9050@berkeley.edu>
Date: Sat, 18 Mar 1995 21:58:23 GMT
References: <1995Mar18.070823.4837@stanford.edu>
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In article <1995Mar18.070823.4837@stanford.edu>, grodriguez@stanford.edu (Göran Rodríguez) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz.

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-- 
Ines Karlsson -- UC Berkeley Department of EECS
"Extraordinary claims require extraordinary spectra."