From btakahashi@cmu.edu Sat Sep 02 20:44:48 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!btakahashi
From: btakahashi@cmu.edu (Bastien Takahashi)
Newsgroups: comp.dsp
Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Sep02.204448.2067@cmu.edu>
Date: Sat, 02 Sep 1995 20:44:48 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).

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

-- 
Bastien Takahashi | btakahashi@cmu.edu
PGP Key fingerprint: 1659 D803 E41D 4AEE
"Keep the channels open."

From tgirard@ox.ac.uk Sun Sep 03 14:29:48 1995
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From: tgirard@ox.ac.uk (Takeshi Girard)
Newsgroups: comp.dsp
Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1995Sep03.142948.6136@ox.ac.uk>
Date: Sun, 03 Sep 1995 14:29:48 GMT
References: <1995Sep02.204448.2067@cmu.edu>
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In article <1995Sep02.204448.2067@cmu.edu>, btakahashi@cmu.edu (Bastien Takahashi) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature.

Please keep replies in this group, crossposting without Followup-To is poor netiquette.

-- 
Takeshi Girard
Tape trading list upon request. SASE required for international mail.