From jokonkwo@pipeline.com Thu Jul 27 00:01:09 1995
Path: ashpoly!cascade!bigsur!pipeline!jokonkwo
From: jokonkwo@pipeline.com (Jen Okonkwo)
Newsgroups: comp.dsp
Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jul27.000109.9589@pipeline.com>
Date: Thu, 27 Jul 1995 00:01:09 GMT
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Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.
This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise.

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

-- 
Jen Okonkwo
Opinions expressed are solely my own and not those of The Pipeline Internet Network.
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From kokonkwo@pipeline.com Thu Jul 27 12:04:09 1995
Path: ashpoly!cascade!brgate!saturno!pipeline!kokonkwo
From: kokonkwo@pipeline.com (Kirsty Okonkwo)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jul27.120409.5425@pipeline.com>
Date: Thu, 27 Jul 1995 12:04:09 GMT
References: <1995Jul27.000109.9589@pipeline.com>
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In article <1995Jul27.000109.9589@pipeline.com>, jokonkwo@pipeline.com (Jen Okonkwo) writes:
> Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line.

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.

-- 
Kirsty Okonkwo
Opinions expressed are solely my own and not those of The Pipeline Internet Network.
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From mito@earthlink.net Thu Jul 27 17:48:09 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!mito
From: mito@earthlink.net (Mike Ito)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jul27.174809.4078@earthlink.net>
Date: Thu, 27 Jul 1995 17:48:09 GMT
References: <1995Jul27.000109.9589@pipeline.com> <1995Jul27.120409.5425@pipeline.com>
Organization: EarthLink Network
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In article <1995Jul27.120409.5425@pipeline.com>, kokonkwo@pipeline.com (Kirsty Okonkwo) 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.

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.

-- 
Mike Ito
Opinions expressed are solely my own and not those of EarthLink Network.
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From btakahashi@netcom.com Fri Jul 28 07:48:09 1995
Path: ashpoly!cascade!bigsur!netcom!btakahashi
From: btakahashi@netcom.com (Bastien Takahashi)
Newsgroups: comp.dsp
Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Jul28.074809.5345@netcom.com>
Date: Fri, 28 Jul 1995 07:48:09 GMT
References: <1995Jul27.000109.9589@pipeline.com> <1995Jul27.120409.5425@pipeline.com> <1995Jul27.174809.4078@earthlink.net>
Organization: NETCOM On-Line Communication Services
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In article <1995Jul27.174809.4078@earthlink.net>, mito@earthlink.net (Mike Ito) 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.

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.

-- 
Bastien Takahashi -- NETCOM On-Line Communication Services
"Measuring a record you own is listening, not piracy."