From fmuller@mit.edu Wed Jul 19 22:38:19 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!fmuller
From: fmuller@mit.edu (Fiona Müller)
Newsgroups: comp.dsp
Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jul19.223819.8966@mit.edu>
Date: Wed, 19 Jul 1995 22:38:19 GMT
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I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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.

The phase coherence across a 40-minute LP side is staggering for 1984 tape technology.

-- 
Fiona Müller
Opinions expressed are solely my own and not those of Massachusetts Institute of Technology.
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From rmartinez@cam.ac.uk Thu Jul 20 18:11:19 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!rmartinez
From: rmartinez@cam.ac.uk (Raj Martínez)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jul20.181119.5116@cam.ac.uk>
Date: Thu, 20 Jul 1995 18:11:19 GMT
References: <1995Jul19.223819.8966@mit.edu>
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In article <1995Jul19.223819.8966@mit.edu>, fmuller@mit.edu (Fiona Müller) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.
> 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.

Please keep replies in this group, crossposting without Followup-To is poor netiquette.

-- 
Raj Martínez
Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory.
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