From lpark@ox.ac.uk Mon Jun 06 01:49:23 1994 Path: ashpoly!cascade!transat!ukc!fennimore!ox!lpark From: lpark@ox.ac.uk (Lucia Park) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun06.014923.8596@ox.ac.uk> Date: Mon, 06 Jun 1994 01:49:23 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N 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. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Lucia Park Hayes Optima 288 @ 14,400 bps "We don't sign stars. We build them." From eandersson@purdue.edu Tue Jun 07 20:23:23 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!eandersson From: eandersson@purdue.edu (Elaine Andersson) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun07.202323.7693@purdue.edu> Date: Tue, 07 Jun 1994 20:23:23 GMT References: <1994Jun06.014923.8596@ox.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Jun06.014923.8596@ox.ac.uk>, lpark@ox.ac.uk (Lucia Park) 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. -- === Elaine Andersson === Dept of Electrical Engineering, Purdue University Engineering Computer Network "We don't sign stars. We build them."