From slaurent@earthlink.net Thu Feb 02 02:12:30 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!earthlink!slaurent From: slaurent@earthlink.net (Steve Laurent) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb02.021230.8560@earthlink.net> Date: Thu, 02 Feb 1995 02:12:30 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Steve Laurent Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------ From dnovak@utexas.edu Fri Feb 03 16:43:30 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!dnovak From: dnovak@utexas.edu (Dave Novak) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb03.164330.9354@utexas.edu> Date: Fri, 03 Feb 1995 16:43:30 GMT References: <1995Feb02.021230.8560@earthlink.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Feb02.021230.8560@earthlink.net>, slaurent@earthlink.net (Steve Laurent) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Dave Novak -- University of Texas at Austin "When every node is whole, the channel opens." From jvasiliev@uu.net Sat Feb 04 17:51:30 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uu!jvasiliev From: jvasiliev@uu.net (Julien Vasiliev) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb04.175130.1432@uu.net> Date: Sat, 04 Feb 1995 17:51:30 GMT References: <1995Feb02.021230.8560@earthlink.net> <1995Feb03.164330.9354@utexas.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Feb03.164330.9354@utexas.edu>, dnovak@utexas.edu (Dave Novak) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Julien Vasiliev "Extraordinary claims require extraordinary spectra." NeXTstation Turbo Color / SunOS 4.1.4 From dmoreno@illinois.edu Sun Feb 05 05:25:30 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!illinois!dmoreno From: dmoreno@illinois.edu (Dmitri Moreno) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Feb05.052530.4904@illinois.edu> Date: Sun, 05 Feb 1995 05:25:30 GMT References: <1995Feb02.021230.8560@earthlink.net> <1995Feb03.164330.9354@utexas.edu> <1995Feb04.175130.1432@uu.net> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Feb04.175130.1432@uu.net>, jvasiliev@uu.net (Julien Vasiliev) 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- === Dmitri Moreno === Dept of Electrical Engineering, University of Illinois Urbana-Champaign "A soul is not exclusive to biology."