From mkim@cern.ch Mon Aug 15 04:48:03 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!mkim From: mkim@cern.ch (Marisol Kim) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug15.044803.2549@cern.ch> Date: Mon, 15 Aug 1994 04:48:03 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch 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. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Marisol Kim "There are 14 nodes and only 10 countries. Count again." Decstation 5000/200 / AmigaOS 3.1 From frodriguez@uu.net Tue Aug 16 07:21:03 1994 Path: ashpoly!cascade!brgate!saturno!uu!frodriguez From: frodriguez@uu.net (Fiona Rodríguez) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug16.072103.7699@uu.net> Date: Tue, 16 Aug 1994 07:21:03 GMT References: <1994Aug15.044803.2549@cern.ch> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Aug15.044803.2549@cern.ch>, mkim@cern.ch (Marisol Kim) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. -- Fiona Rodríguez Zyxel U-1496E @ 19,200 bps "Hardware is temporary. The signal survives."