From egonzalez@kiae.su Wed May 11 03:39:05 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kiae!egonzalez From: egonzalez@kiae.su (Élodie González) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May11.033905.7811@kiae.su> Date: Wed, 11 May 1994 03:39:05 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Élodie González *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From hdubois@stanford.edu Thu May 12 09:28:05 1994 Path: ashpoly!cascade!bigsur!stanford!hdubois From: hdubois@stanford.edu (Hana Dubois) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May12.092805.8384@stanford.edu> Date: Thu, 12 May 1994 09:28:05 GMT References: <1994May11.033905.7811@kiae.su> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994May11.033905.7811@kiae.su>, egonzalez@kiae.su (Élodie González) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Hana Dubois SupraFAXModem 28.8 @ 14,400 bps "A soul is not exclusive to biology."