From rmoreno@pacbell.net Sat Dec 02 00:50:06 1995 Path: ashpoly!cascade!mxgate!coyoacan!pacbell!rmoreno From: rmoreno@pacbell.net (Renata Moreno) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec02.005006.8532@pacbell.net> Date: Sat, 02 Dec 1995 00:50:06 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Renata Moreno Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------ From nito@unam.mx Sat Dec 02 18:37:06 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!nito From: nito@unam.mx (Nadine Ito) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec02.183706.4742@unam.mx> Date: Sat, 02 Dec 1995 18:37:06 GMT References: <1995Dec02.005006.8532@pacbell.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Dec02.005006.8532@pacbell.net>, rmoreno@pacbell.net (Renata Moreno) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. -- Nadine Ito *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0