From kchoi@stanford.edu Mon Jul 22 12:32:20 1996 Path: ashpoly!cascade!mxgate!coyoacan!stanford!kchoi From: kchoi@stanford.edu (Karen Choi) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul22.123220.1761@stanford.edu> Date: Mon, 22 Jul 1996 12:32:20 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Karen Choi *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From kvasiliev@illinois.edu Tue Jul 23 08:45:20 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!kvasiliev From: kvasiliev@illinois.edu (Karen Vasiliev) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul23.084520.4771@illinois.edu> Date: Tue, 23 Jul 1996 08:45:20 GMT References: <1996Jul22.123220.1761@stanford.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Jul22.123220.1761@stanford.edu>, kchoi@stanford.edu (Karen Choi) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Karen Vasiliev *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From enovak@demon.co.uk Thu Jul 25 11:20:20 1996 Path: ashpoly!cascade!mxgate!coyoacan!demon!enovak From: enovak@demon.co.uk (Élodie Novak) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul25.112020.6172@demon.co.uk> Date: Thu, 25 Jul 1996 11:20:20 GMT References: <1996Jul22.123220.1761@stanford.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Jul22.123220.1761@stanford.edu>, kchoi@stanford.edu (Karen Choi) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. 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. -- Élodie Novak Practical Peripherals 14.4 @ 19,200 bps "A soul is not exclusive to biology." From heriksson@berkeley.edu Sat Jul 27 07:01:20 1996 Path: ashpoly!cascade!bigsur!berkeley!heriksson From: heriksson@berkeley.edu (Hana Eriksson) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul27.070120.1312@berkeley.edu> Date: Sat, 27 Jul 1996 07:01:20 GMT References: <1996Jul22.123220.1761@stanford.edu> <1996Jul23.084520.4771@illinois.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Jul23.084520.4771@illinois.edu>, kvasiliev@illinois.edu (Karen Vasiliev) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. 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. -- === Hana Eriksson === Dept of Electrical Engineering, UC Berkeley Department of EECS "Hold for relay." From ldubois@tum.de Mon Jul 29 08:48:20 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!ldubois From: ldubois@tum.de (Lars Dubois) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul29.084820.2452@tum.de> Date: Mon, 29 Jul 1996 08:48:20 GMT References: <1996Jul22.123220.1761@stanford.edu> <1996Jul23.084520.4771@illinois.edu> <1996Jul27.070120.1312@berkeley.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Jul27.070120.1312@berkeley.edu>, heriksson@berkeley.edu (Hana Eriksson) 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. 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. -- Lars Dubois -- Technische Universität München "The carrier frequency does not drift by accident."