From rpark@demon.co.uk Wed Jan 10 20:17:48 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!rpark
From: rpark@demon.co.uk (Rodrigo Park)
Newsgroups: comp.dsp
Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jan10.201748.6976@demon.co.uk>
Date: Wed, 10 Jan 1996 20:17:48 GMT
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Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs).
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?

-- 
Rodrigo Park <rpark@demon.co.uk>
US Robotics Courier V.34 @ 33,600 bps
"Measuring a record you own is listening, not piracy."

From skarlsson@hanse.de Thu Jan 11 18:10:48 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!skarlsson
From: skarlsson@hanse.de (Steve Karlsson)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jan11.181048.9704@hanse.de>
Date: Thu, 11 Jan 1996 18:10:48 GMT
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In article <1996Jan10.201748.6976@demon.co.uk>, rpark@demon.co.uk (Rodrigo Park) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless.

-- 
Steve Karlsson | skarlsson@hanse.de
PGP Key fingerprint: 420E D455 633E A7B6
"Keep the channels open."

From oandersson@berkeley.edu Fri Jan 12 02:23:48 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!oandersson
From: oandersson@berkeley.edu (Olga Andersson)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Jan12.022348.4364@berkeley.edu>
Date: Fri, 12 Jan 1996 02:23:48 GMT
References: <1996Jan10.201748.6976@demon.co.uk> <1996Jan11.181048.9704@hanse.de>
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In article <1996Jan11.181048.9704@hanse.de>, skarlsson@hanse.de (Steve Karlsson) writes:
> Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless.

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.

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

-- 
Olga Andersson
Tape trading list upon request. SASE required for international mail.