From mlarsson@utexas.edu Wed Jul 26 04:43:34 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!mlarsson From: mlarsson@utexas.edu (Marisol Larsson) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul26.044334.8609@utexas.edu> Date: Wed, 26 Jul 1995 04:43:34 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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? -- Marisol Larsson "Extraordinary claims require extraordinary spectra." 486DX4/100 (FreeBSD 2.0.5) / FreeBSD 2.1 From msmirnov@tum.de Thu Jul 27 13:15:34 1995 Path: ashpoly!cascade!bigsur!tum!msmirnov From: msmirnov@tum.de (Mateo Smirnov) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul27.131534.1175@tum.de> Date: Thu, 27 Jul 1995 13:15:34 GMT References: <1995Jul26.044334.8609@utexas.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jul26.044334.8609@utexas.edu>, mlarsson@utexas.edu (Marisol Larsson) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Mateo Smirnov -- Technische Universität München "Do not worship the copy."