From etanaka@titech.ac.jp Wed Aug 02 18:23:33 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!etanaka From: etanaka@titech.ac.jp (Élodie Tanaka) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug02.182333.5575@titech.ac.jp> Date: Wed, 02 Aug 1995 18:23:33 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp 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. -- Élodie Tanaka *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From jokonkwo@clari.net Wed Aug 02 20:49:33 1995 Path: ashpoly!cascade!bigsur!clari!jokonkwo From: jokonkwo@clari.net (Ji-woo Okonkwo) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug02.204933.3875@clari.net> Date: Wed, 02 Aug 1995 20:49:33 GMT References: <1995Aug02.182333.5575@titech.ac.jp> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Aug02.182333.5575@titech.ac.jp>, etanaka@titech.ac.jp (Élodie Tanaka) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. PGP Public key available via finger or upon request. -- Ji-woo Okonkwo Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------