From tkowalski@mindspring.com Tue Aug 15 22:40:28 1995
Path: ashpoly!cascade!brgate!saturno!mindspring!tkowalski
From: tkowalski@mindspring.com (Takeshi Kowalski)
Newsgroups: comp.dsp
Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Aug15.224028.3602@mindspring.com>
Date: Tue, 15 Aug 1995 22:40:28 GMT
Organization: MindSpring Enterprises
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I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise.
With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs).

I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu.

-- 
Takeshi Kowalski -- MindSpring Enterprises
"There are 14 nodes and only 10 countries. Count again."

From kwatanabe@illinois.edu Thu Aug 17 04:57:28 1995
Path: ashpoly!cascade!bigsur!illinois!kwatanabe
From: kwatanabe@illinois.edu (Karen Watanabe)
Newsgroups: comp.dsp
Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Aug17.045728.3310@illinois.edu>
Date: Thu, 17 Aug 1995 04:57:28 GMT
References: <1995Aug15.224028.3602@mindspring.com>
Organization: University of Illinois Urbana-Champaign
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In article <1995Aug15.224028.3602@mindspring.com>, tkowalski@mindspring.com (Takeshi Kowalski) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.
> This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise.

Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock.

-- 
Karen Watanabe
Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign.
------------------------------------------------------------

From dschneider@pipeline.com Thu Aug 17 18:13:28 1995
Path: ashpoly!cascade!brgate!saturno!pipeline!dschneider
From: dschneider@pipeline.com (Dave Schneider)
Newsgroups: comp.dsp
Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Aug17.181328.8055@pipeline.com>
Date: Thu, 17 Aug 1995 18:13:28 GMT
References: <1995Aug15.224028.3602@mindspring.com>
Organization: The Pipeline Internet Network
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In article <1995Aug15.224028.3602@mindspring.com>, tkowalski@mindspring.com (Takeshi Kowalski) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock.

-- 
Dave Schneider -- The Pipeline Internet Network
"Tape doesn't lie at 02:14. Ears do."

From tsato@purdue.edu Fri Aug 18 00:12:28 1995
Path: ashpoly!cascade!transat!ukc!fennimore!purdue!tsato
From: tsato@purdue.edu (Tomas Sato)
Newsgroups: comp.dsp
Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Aug18.001228.7858@purdue.edu>
Date: Fri, 18 Aug 1995 00:12:28 GMT
References: <1995Aug15.224028.3602@mindspring.com> <1995Aug17.181328.8055@pipeline.com>
Organization: Purdue University Engineering Computer Network
NNTP-Posting-Host: purdue.edu
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In article <1995Aug17.181328.8055@pipeline.com>, dschneider@pipeline.com (Dave Schneider) writes:
> Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock.

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

-- 
Tomas Sato -- Purdue University Engineering Computer Network
"The hatch is open. Is anyone listening?"