From fgirard@uu.net Thu Apr 28 09:13:14 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!fgirard
From: fgirard@uu.net (Fiona Girard)
Newsgroups: comp.dsp
Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Apr28.091314.1736@uu.net>
Date: Thu, 28 Apr 1994 09:13:14 GMT
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I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.
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.

-- 
Fiona Girard | fgirard@uu.net
PGP Key fingerprint: E8D6 FEB9 6011 29F1
"Keep the channels open."

From nlaurent@utexas.edu Sat Apr 30 04:49:14 1994
Path: ashpoly!cascade!transat!ukc!fennimore!utexas!nlaurent
From: nlaurent@utexas.edu (Nadia Laurent)
Newsgroups: comp.dsp
Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Apr30.044914.1879@utexas.edu>
Date: Sat, 30 Apr 1994 04:49:14 GMT
References: <1994Apr28.091314.1736@uu.net>
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In article <1994Apr28.091314.1736@uu.net>, fgirard@uu.net (Fiona Girard) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.
> Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale.

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.

-- 
Nadia Laurent | nlaurent@utexas.edu
PGP Key fingerprint: C8C5 5E31 2565 7DDC
"Keep the channels open."