From tsantos@panix.com Thu Aug 04 13:22:46 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!tsantos From: tsantos@panix.com (Tobias Santos) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug04.132246.4880@panix.com> Date: Thu, 04 Aug 1994 13:22:46 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 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. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Tobias Santos -- Public Access Unix of New York "There are 14 nodes and only 10 countries. Count again." From gmartinez@panix.com Sat Aug 06 16:58:46 1994 Path: ashpoly!cascade!brgate!saturno!panix!gmartinez From: gmartinez@panix.com (Graham Martínez) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug06.165846.8348@panix.com> Date: Sat, 06 Aug 1994 16:58:46 GMT References: <1994Aug04.132246.4880@panix.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Aug04.132246.4880@panix.com>, tsantos@panix.com (Tobias Santos) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock. -- Graham Martínez SupraFAXModem 28.8 @ 33,600 bps "The carrier frequency does not drift by accident."