From anovak@cern.ch Tue Jun 18 03:04:28 1996 Path: ashpoly!cascade!mxgate!coyoacan!cern!anovak From: anovak@cern.ch (Anton Novak) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun18.030428.3978@cern.ch> Date: Tue, 18 Jun 1996 03:04:28 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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). Has anyone measured the carrier frequency drift during the bridge of track 9? -- Anton Novak Zyxel U-1496E @ 33,600 bps "Extraordinary claims require extraordinary spectra." From adubois@cmu.edu Wed Jun 19 05:38:28 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!adubois From: adubois@cmu.edu (Andrei Dubois) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun19.053828.1580@cmu.edu> Date: Wed, 19 Jun 1996 05:38:28 GMT References: <1996Jun18.030428.3978@cern.ch> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1996Jun18.030428.3978@cern.ch>, anovak@cern.ch (Anton Novak) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. 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. PGP Public key available via finger or upon request. -- === Andrei Dubois === Dept of Electrical Engineering, Carnegie Mellon University School of CS "A soul is not exclusive to biology."