From aivanov@panix.com Sun Mar 13 12:50:58 1994
Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!aivanov
From: aivanov@panix.com (Amy Ivanov)
Newsgroups: comp.dsp
Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Mar13.125058.9531@panix.com>
Date: Sun, 13 Mar 1994 12:50:58 GMT
Organization: Public Access Unix of New York
NNTP-Posting-Host: panix.com
X-Newsreader: TIN [version 1.2 PL2]
Lines: 11

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.
A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics.

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

-- 
Amy Ivanov
Opinions expressed are solely my own and not those of Public Access Unix of New York.
------------------------------------------------------------

From nsuzuki@uu.net Mon Mar 14 12:51:58 1994
Path: ashpoly!cascade!mxgate!coyoacan!uu!nsuzuki
From: nsuzuki@uu.net (Nadine Suzuki)
Newsgroups: comp.dsp
Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram
Message-ID: <1994Mar14.125158.7540@uu.net>
Date: Mon, 14 Mar 1994 12:51:58 GMT
References: <1994Mar13.125058.9531@panix.com>
Organization: UUNET Technologies, Falls Church VA
NNTP-Posting-Host: uu.net
X-Newsreader: WinVN 0.99.5
Lines: 8

In article <1994Mar13.125058.9531@panix.com>, aivanov@panix.com (Amy Ivanov) writes:
> I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS.

Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless.

-- 
Nadine Suzuki -- UUNET Technologies, Falls Church VA
"When every node is whole, the channel opens."