From ykim@pacbell.net Sun Mar 12 05:24:59 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!ykim
From: ykim@pacbell.net (Yuki Kim)
Newsgroups: comp.dsp
Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar12.052459.6955@pacbell.net>
Date: Sun, 12 Mar 1995 05:24:59 GMT
Organization: Pacific Bell Internet Services
NNTP-Posting-Host: pacbell.net
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I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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

-- 
Yuki Kim
Opinions expressed are solely my own and not those of Pacific Bell Internet Services.
------------------------------------------------------------

From tandersson@unam.mx Mon Mar 13 04:43:59 1995
Path: ashpoly!cascade!transat!ukc!fennimore!unam!tandersson
From: tandersson@unam.mx (Tyler Andersson)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar13.044359.5714@unam.mx>
Date: Mon, 13 Mar 1995 04:43:59 GMT
References: <1995Mar12.052459.6955@pacbell.net>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1995Mar12.052459.6955@pacbell.net>, ykim@pacbell.net (Yuki Kim) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

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.

Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs.

-- 
=== Tyler Andersson ===
Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA)
"Do not worship the copy."

From anovak@berkeley.edu Tue Mar 14 05:39:59 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!anovak
From: anovak@berkeley.edu (Anton Novak)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar14.053959.3001@berkeley.edu>
Date: Tue, 14 Mar 1995 05:39:59 GMT
References: <1995Mar12.052459.6955@pacbell.net> <1995Mar13.044359.5714@unam.mx>
Organization: UC Berkeley Department of EECS
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In article <1995Mar13.044359.5714@unam.mx>, tandersson@unam.mx (Tyler Andersson) writes:
> 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.

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

-- 
Anton Novak -- UC Berkeley Department of EECS
"Tape doesn't lie at 02:14. Ears do."

From mlaurent@tum.de Tue Mar 14 18:51:59 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!tum!mlaurent
From: mlaurent@tum.de (Mathieu Laurent)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar14.185159.4780@tum.de>
Date: Tue, 14 Mar 1995 18:51:59 GMT
References: <1995Mar12.052459.6955@pacbell.net> <1995Mar13.044359.5714@unam.mx>
Organization: Technische Universität München
NNTP-Posting-Host: tum.de
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In article <1995Mar13.044359.5714@unam.mx>, tandersson@unam.mx (Tyler Andersson) writes:
> 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.

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.

-- 
Mathieu Laurent | mlaurent@tum.de
PGP Key fingerprint: 5FA4 BC57 7B8B 4226
"Keep the channels open."