From dfournier@clari.net Sat May 28 03:59:41 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!clari!dfournier From: dfournier@clari.net (Diego Fournier) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May28.035941.1637@clari.net> Date: Sat, 28 May 1994 03:59:41 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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? -- Diego Fournier "Extraordinary claims require extraordinary spectra." Acorn RiscPC 600 / Linux 1.2.13 From rito@mit.edu Mon May 30 01:35:41 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!rito From: rito@mit.edu (Renata Ito) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994May30.013541.5060@mit.edu> Date: Mon, 30 May 1994 01:35:41 GMT References: <1994May28.035941.1637@clari.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994May28.035941.1637@clari.net>, dfournier@clari.net (Diego Fournier) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Renata Ito | rito@mit.edu PGP Key fingerprint: 3888 7404 8676 081D "Keep the channels open."