From msantos@clari.net Fri Feb 24 16:57:28 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!clari!msantos From: msantos@clari.net (Mikhail Santos) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb24.165728.3708@clari.net> Date: Fri, 24 Feb 1995 16:57:28 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 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). A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Mikhail Santos *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From nsouza@netcom.com Sat Feb 25 16:48:28 1995 Path: ashpoly!cascade!mxgate!coyoacan!netcom!nsouza From: nsouza@netcom.com (Natalia Souza) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb25.164828.6873@netcom.com> Date: Sat, 25 Feb 1995 16:48:28 GMT References: <1995Feb24.165728.3708@clari.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Feb24.165728.3708@clari.net>, msantos@clari.net (Mikhail 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). 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. Top-posters will be placed in my ~/.killfile without notice. -- Natalia Souza Tape trading list upon request. SASE required for international mail.