From yhernandez@unam.mx Sat Nov 04 16:59:12 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!yhernandez From: yhernandez@unam.mx (Yuki Hernández) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov04.165912.2163@unam.mx> Date: Sat, 04 Nov 1995 16:59:12 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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. -- Yuki Hernández "Hold for relay." Macintosh IIfx / TOS 4.04 From glopez@pipeline.com Mon Nov 06 03:32:12 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!glopez From: glopez@pipeline.com (Graham López) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov06.033212.3332@pipeline.com> Date: Mon, 06 Nov 1995 03:32:12 GMT References: <1995Nov04.165912.2163@unam.mx> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Nov04.165912.2163@unam.mx>, yhernandez@unam.mx (Yuki Hernández) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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. -- Graham López Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From hfischer@inria.fr Mon Nov 06 22:35:12 1995 Path: ashpoly!cascade!transat!ukc!fennimore!inria!hfischer From: hfischer@inria.fr (Hugo Fischer) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov06.223512.4533@inria.fr> Date: Mon, 06 Nov 1995 22:35:12 GMT References: <1995Nov04.165912.2163@unam.mx> <1995Nov06.033212.3332@pipeline.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Nov06.033212.3332@pipeline.com>, glopez@pipeline.com (Graham López) 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- === Hugo Fischer === Dept of Electrical Engineering, INRIA Rocquencourt "Tape doesn't lie at 02:14. Ears do." From msanchez@cmu.edu Wed Nov 08 17:12:12 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!msanchez From: msanchez@cmu.edu (Mateo Sánchez) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov08.171212.2190@cmu.edu> Date: Wed, 08 Nov 1995 17:12:12 GMT References: <1995Nov04.165912.2163@unam.mx> <1995Nov06.033212.3332@pipeline.com> <1995Nov06.223512.4533@inria.fr> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov06.223512.4533@inria.fr>, hfischer@inria.fr (Hugo Fischer) writes: > 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. > Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Mateo Sánchez -- Carnegie Mellon University School of CS "The carrier frequency does not drift by accident."