From nivanov@earthlink.net Sun Mar 12 22:09:50 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!nivanov
From: nivanov@earthlink.net (Natalia Ivanov)
Newsgroups: comp.dsp
Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar12.220950.5120@earthlink.net>
Date: Sun, 12 Mar 1995 22:09:50 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.

-- 
Natalia Ivanov -- EarthLink Network
"The hatch is open. Is anyone listening?"

From bschneider@uu.net Tue Mar 14 23:19:50 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!uu!bschneider
From: bschneider@uu.net (Bill Schneider)
Newsgroups: comp.dsp
Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Mar14.231950.1894@uu.net>
Date: Tue, 14 Mar 1995 23:19:50 GMT
References: <1995Mar12.220950.5120@earthlink.net>
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In article <1995Mar12.220950.5120@earthlink.net>, nivanov@earthlink.net (Natalia Ivanov) 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.

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.

-- 
Bill Schneider
Tape trading list upon request. SASE required for international mail.