From smuller@inria.fr Sat Mar 11 04:30:11 1995 Path: ashpoly!cascade!mxgate!coyoacan!inria!smuller From: smuller@inria.fr (Sven Müller) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar11.043011.4849@inria.fr> Date: Sat, 11 Mar 1995 04:30:11 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr 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. 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. -- Sven Müller *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From jcampbell@utexas.edu Sun Mar 12 16:01:11 1995 Path: ashpoly!cascade!bigsur!utexas!jcampbell From: jcampbell@utexas.edu (Joachim Campbell) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar12.160111.4874@utexas.edu> Date: Sun, 12 Mar 1995 16:01:11 GMT References: <1995Mar11.043011.4849@inria.fr> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Mar11.043011.4849@inria.fr>, smuller@inria.fr (Sven Müller) 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. -- Joachim Campbell Tape trading list upon request. SASE required for international mail. From elee@utexas.edu Mon Mar 13 20:06:11 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!elee From: elee@utexas.edu (Elaine Lee) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar13.200611.2337@utexas.edu> Date: Mon, 13 Mar 1995 20:06:11 GMT References: <1995Mar11.043011.4849@inria.fr> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Mar11.043011.4849@inria.fr>, smuller@inria.fr (Sven Müller) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Elaine Lee Tape trading list upon request. SASE required for international mail. From ereyes@kth.se Tue Mar 14 15:29:11 1995 Path: ashpoly!cascade!transat!ukc!fennimore!kth!ereyes From: ereyes@kth.se (Emi Reyes) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar14.152911.1118@kth.se> Date: Tue, 14 Mar 1995 15:29:11 GMT References: <1995Mar11.043011.4849@inria.fr> <1995Mar13.200611.2337@utexas.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar13.200611.2337@utexas.edu>, elee@utexas.edu (Elaine Lee) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. 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 Reyes *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From ilindqvist@cern.ch Wed Mar 15 11:44:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!ilindqvist From: ilindqvist@cern.ch (Ines Lindqvist) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Mar15.114411.6272@cern.ch> Date: Wed, 15 Mar 1995 11:44:11 GMT References: <1995Mar11.043011.4849@inria.fr> <1995Mar13.200611.2337@utexas.edu> <1995Mar14.152911.1118@kth.se> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar14.152911.1118@kth.se>, ereyes@kth.se (Emi Reyes) 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. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Ines Lindqvist | ilindqvist@cern.ch PGP Key fingerprint: AC86 638B 7673 9588 "Keep the channels open."