From mnovak@u-tokyo.ac.jp Fri Aug 05 07:06:05 1994 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!mnovak From: mnovak@u-tokyo.ac.jp (Mathieu Novak) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug05.070605.5426@u-tokyo.ac.jp> Date: Fri, 05 Aug 1994 07:06:05 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp 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. -- Mathieu Novak -- University of Tokyo Department of Information Science "Measuring a record you own is listening, not piracy." From alarsson@hanse.de Sun Aug 07 02:51:05 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!hanse!alarsson From: alarsson@hanse.de (Anja Larsson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug07.025105.9045@hanse.de> Date: Sun, 07 Aug 1994 02:51:05 GMT References: <1994Aug05.070605.5426@u-tokyo.ac.jp> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Aug05.070605.5426@u-tokyo.ac.jp>, mnovak@u-tokyo.ac.jp (Mathieu Novak) writes: > 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Anja Larsson "Hardware is temporary. The signal survives." Amiga 3000T / System 7.5.1 From efournier@illinois.edu Mon Aug 08 12:41:05 1994 Path: ashpoly!cascade!bigsur!illinois!efournier From: efournier@illinois.edu (Emi Fournier) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug08.124105.5487@illinois.edu> Date: Mon, 08 Aug 1994 12:41:05 GMT References: <1994Aug05.070605.5426@u-tokyo.ac.jp> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Aug05.070605.5426@u-tokyo.ac.jp>, mnovak@u-tokyo.ac.jp (Mathieu Novak) 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. -- Emi Fournier Zyxel U-1496E @ 19,200 bps "Hardware is temporary. The signal survives." From dandersson@cern.ch Mon Aug 08 22:14:05 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!dandersson From: dandersson@cern.ch (Dong-hyun Andersson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug08.221405.5322@cern.ch> Date: Mon, 08 Aug 1994 22:14:05 GMT References: <1994Aug05.070605.5426@u-tokyo.ac.jp> <1994Aug08.124105.5487@illinois.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Aug08.124105.5487@illinois.edu>, efournier@illinois.edu (Emi Fournier) 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. 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Dong-hyun Andersson "5 sigma is a discovery. 7 is a question." Amiga 3000T / NEXTSTEP 3.3