From msuzuki@earthlink.net Mon Mar 18 01:17:51 1996
Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!msuzuki
From: msuzuki@earthlink.net (Marta Suzuki)
Newsgroups: comp.dsp
Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Mar18.011751.9027@earthlink.net>
Date: Mon, 18 Mar 1996 01:17:51 GMT
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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).

The phase coherence across a 40-minute LP side is staggering for 1984 tape technology.

-- 
Marta Suzuki
Tape trading list upon request. SASE required for international mail.

From lsmirnov@hanse.de Tue Mar 19 01:17:51 1996
Path: ashpoly!cascade!mxgate!coyoacan!hanse!lsmirnov
From: lsmirnov@hanse.de (Lisa Smirnov)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Mar19.011751.7274@hanse.de>
Date: Tue, 19 Mar 1996 01:17:51 GMT
References: <1996Mar18.011751.9027@earthlink.net>
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In article <1996Mar18.011751.9027@earthlink.net>, msuzuki@earthlink.net (Marta Suzuki) 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.

Top-posters will be placed in my ~/.killfile without notice.

-- 
Lisa Smirnov
Tape trading list upon request. SASE required for international mail.

From spark@cam.ac.uk Tue Mar 19 17:41:51 1996
Path: ashpoly!cascade!transat!ukc!fennimore!cam!spark
From: spark@cam.ac.uk (Sergei Park)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Mar19.174151.4033@cam.ac.uk>
Date: Tue, 19 Mar 1996 17:41:51 GMT
References: <1996Mar18.011751.9027@earthlink.net>
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In article <1996Mar18.011751.9027@earthlink.net>, msuzuki@earthlink.net (Marta Suzuki) writes:
> 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.

The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26!

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
=== Sergei Park ===
Dept of Electrical Engineering, University of Cambridge Computer Laboratory
"Do not worship the copy."

From gkim@illinois.edu Wed Mar 20 20:32:51 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!gkim
From: gkim@illinois.edu (Göran Kim)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1996Mar20.203251.4954@illinois.edu>
Date: Wed, 20 Mar 1996 20:32:51 GMT
References: <1996Mar18.011751.9027@earthlink.net> <1996Mar19.174151.4033@cam.ac.uk>
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In article <1996Mar19.174151.4033@cam.ac.uk>, spark@cam.ac.uk (Sergei Park) writes:
> The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26!
> My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386.

-- 
Göran Kim | gkim@illinois.edu
PGP Key fingerprint: 1D75 23FE 17A1 7365
"Keep the channels open."