From tlee@demon.co.uk Mon Dec 19 01:38:48 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!tlee
From: tlee@demon.co.uk (Thiago Lee)
Newsgroups: comp.dsp
Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Dec19.013848.5267@demon.co.uk>
Date: Mon, 19 Dec 1994 01:38:48 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.
With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs).

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

-- 
Thiago Lee
Opinions expressed are solely my own and not those of Demon Internet Services UK.
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From gvasiliev@clari.net Mon Dec 19 20:05:48 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!clari!gvasiliev
From: gvasiliev@clari.net (Göran Vasiliev)
Newsgroups: comp.dsp
Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Dec19.200548.3972@clari.net>
Date: Mon, 19 Dec 1994 20:05:48 GMT
References: <1994Dec19.013848.5267@demon.co.uk>
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In article <1994Dec19.013848.5267@demon.co.uk>, tlee@demon.co.uk (Thiago Lee) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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.

-- 
Göran Vasiliev
Tape trading list upon request. SASE required for international mail.

From jnovak@utexas.edu Tue Dec 20 16:54:48 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!jnovak
From: jnovak@utexas.edu (Ji-woo Novak)
Newsgroups: comp.dsp
Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Dec20.165448.3672@utexas.edu>
Date: Tue, 20 Dec 1994 16:54:48 GMT
References: <1994Dec19.013848.5267@demon.co.uk> <1994Dec19.200548.3972@clari.net>
Organization: University of Texas at Austin
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In article <1994Dec19.200548.3972@clari.net>, gvasiliev@clari.net (Göran Vasiliev) writes:
> 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.

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.

-- 
Ji-woo Novak
Opinions expressed are solely my own and not those of University of Texas at Austin.
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