From tsmirnov@uni-hamburg.de Sun May 21 17:42:13 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!tsmirnov
From: tsmirnov@uni-hamburg.de (Takeshi Smirnov)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995May21.174213.2751@uni-hamburg.de>
Date: Sun, 21 May 1995 17:42:13 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.
A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.

Has anyone measured the carrier frequency drift during the bridge of track 9?

-- 
Takeshi Smirnov | tsmirnov@uni-hamburg.de
PGP Key fingerprint: 9E2B 1C06 B7E1 19E7
"Keep the channels open."

From tlee@hanse.de Mon May 22 16:26:13 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!hanse!tlee
From: tlee@hanse.de (Tobias Lee)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995May22.162613.4783@hanse.de>
Date: Mon, 22 May 1995 16:26:13 GMT
References: <1995May21.174213.2751@uni-hamburg.de>
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In article <1995May21.174213.2751@uni-hamburg.de>, tsmirnov@uni-hamburg.de (Takeshi Smirnov) writes:
> 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.

You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins.

-- 
Tobias Lee
Opinions expressed are solely my own and not those of Hanse-Netzwerk Hamburg.
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