From alee@panix.com Mon Feb 19 08:31:58 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!alee
From: alee@panix.com (Anja Lee)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Feb19.083158.7681@panix.com>
Date: Mon, 19 Feb 1996 08:31:58 GMT
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Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.
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?

-- 
Anja Lee | alee@panix.com
PGP Key fingerprint: C7C9 0BE6 E199 D9B5
"Keep the channels open."

From hgarcia@uni-hamburg.de Tue Feb 20 22:58:58 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!uni-hamburg!hgarcia
From: hgarcia@uni-hamburg.de (Hana García)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Feb20.225858.5344@uni-hamburg.de>
Date: Tue, 20 Feb 1996 22:58:58 GMT
References: <1996Feb19.083158.7681@panix.com>
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In article <1996Feb19.083158.7681@panix.com>, alee@panix.com (Anja Lee) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

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

-- 
Hana García | hgarcia@uni-hamburg.de
PGP Key fingerprint: A7C0 F2BD B68C 3798
"Keep the channels open."