From tsantos@utexas.edu Thu Apr 13 01:59:51 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!tsantos From: tsantos@utexas.edu (Tyler Santos) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr13.015951.6567@utexas.edu> Date: Thu, 13 Apr 1995 01:59:51 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. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Tyler Santos "They will send a copy in my place." Pentium 90 (OS/2 Warp) / AmigaOS 3.1 From vsokolov@utexas.edu Fri Apr 14 13:05:51 1995 Path: ashpoly!cascade!brgate!saturno!utexas!vsokolov From: vsokolov@utexas.edu (Valeria Sokolov) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Apr14.130551.8841@utexas.edu> Date: Fri, 14 Apr 1995 13:05:51 GMT References: <1995Apr13.015951.6567@utexas.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Apr13.015951.6567@utexas.edu>, tsantos@utexas.edu (Tyler Santos) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Valeria Sokolov *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0