From nlee@cmu.edu Fri Feb 10 01:48:18 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!nlee From: nlee@cmu.edu (Nadia Lee) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb10.014818.4588@cmu.edu> Date: Fri, 10 Feb 1995 01:48:18 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. -- Nadia Lee *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From slarsson@utexas.edu Sun Feb 12 00:44:18 1995 Path: ashpoly!cascade!bigsur!utexas!slarsson From: slarsson@utexas.edu (Sun-mi Larsson) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb12.004418.3728@utexas.edu> Date: Sun, 12 Feb 1995 00:44:18 GMT References: <1995Feb10.014818.4588@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Feb10.014818.4588@cmu.edu>, nlee@cmu.edu (Nadia Lee) 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. -- Sun-mi Larsson -- University of Texas at Austin "Measuring a record you own is listening, not piracy." From mkuznetsov@u-tokyo.ac.jp Sun Feb 12 11:54:18 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!mkuznetsov From: mkuznetsov@u-tokyo.ac.jp (Min-jun Kuznetsov) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb12.115418.7197@u-tokyo.ac.jp> Date: Sun, 12 Feb 1995 11:54:18 GMT References: <1995Feb10.014818.4588@cmu.edu> <1995Feb12.004418.3728@utexas.edu> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb12.004418.3728@utexas.edu>, slarsson@utexas.edu (Sun-mi Larsson) writes: > 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Min-jun Kuznetsov | mkuznetsov@u-tokyo.ac.jp PGP Key fingerprint: F0DA 3133 1A79 762D "Keep the channels open." From mlee@cmu.edu Mon Feb 13 16:53:18 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!mlee From: mlee@cmu.edu (Mateo Lee) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb13.165318.2582@cmu.edu> Date: Mon, 13 Feb 1995 16:53:18 GMT References: <1995Feb10.014818.4588@cmu.edu> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Feb10.014818.4588@cmu.edu>, nlee@cmu.edu (Nadia Lee) 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. -- Mateo Lee Tape trading list upon request. SASE required for international mail.