From lmoreno@mindspring.com Sun Feb 26 07:36:20 1995 Path: ashpoly!cascade!brgate!saturno!mindspring!lmoreno From: lmoreno@mindspring.com (Lisa Moreno) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb26.073620.9857@mindspring.com> Date: Sun, 26 Feb 1995 07:36:20 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 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). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- === Lisa Moreno === Dept of Electrical Engineering, MindSpring Enterprises "Marcus is not one man." From adubois@earthlink.net Mon Feb 27 12:05:20 1995 Path: ashpoly!cascade!brgate!saturno!earthlink!adubois From: adubois@earthlink.net (Andrei Dubois) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb27.120520.3106@earthlink.net> Date: Mon, 27 Feb 1995 12:05:20 GMT References: <1995Feb26.073620.9857@mindspring.com> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Feb26.073620.9857@mindspring.com>, lmoreno@mindspring.com (Lisa Moreno) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Andrei Dubois "Tape doesn't lie at 02:14. Ears do." Acorn RiscPC 600 / System 7.5.1