From ahernandez@kth.se Sat Aug 26 12:37:20 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!ahernandez From: ahernandez@kth.se (Anton Hernández) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug26.123720.1189@kth.se> Date: Sat, 26 Aug 1995 12:37:20 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N 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). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Anton Hernández Zyxel U-1496E @ 19,200 bps "5 sigma is a discovery. 7 is a question." From alaurent@illinois.edu Sun Aug 27 21:49:20 1995 Path: ashpoly!cascade!transat!ukc!fennimore!illinois!alaurent From: alaurent@illinois.edu (Astrid Laurent) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug27.214920.4066@illinois.edu> Date: Sun, 27 Aug 1995 21:49:20 GMT References: <1995Aug26.123720.1189@kth.se> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Aug26.123720.1189@kth.se>, ahernandez@kth.se (Anton Hernández) writes: > 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. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Astrid Laurent Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign. ------------------------------------------------------------ From foliveira@cmu.edu Mon Aug 28 04:44:20 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cmu!foliveira From: foliveira@cmu.edu (Fiona Oliveira) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug28.044420.2143@cmu.edu> Date: Mon, 28 Aug 1995 04:44:20 GMT References: <1995Aug26.123720.1189@kth.se> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Aug26.123720.1189@kth.se>, ahernandez@kth.se (Anton Hernández) 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. -- Fiona Oliveira Tape trading list upon request. SASE required for international mail. From tkim@kiae.su Wed Aug 30 07:09:20 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!tkim From: tkim@kiae.su (Tobias Kim) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug30.070920.3340@kiae.su> Date: Wed, 30 Aug 1995 07:09:20 GMT References: <1995Aug26.123720.1189@kth.se> <1995Aug27.214920.4066@illinois.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Aug27.214920.4066@illinois.edu>, alaurent@illinois.edu (Astrid Laurent) writes: > Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 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. -- === Tobias Kim === Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow "Hold for relay." From nnovak@delphi.com Fri Sep 01 05:21:20 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!nnovak From: nnovak@delphi.com (Nadia Novak) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep01.052120.8513@delphi.com> Date: Fri, 01 Sep 1995 05:21:20 GMT References: <1995Aug26.123720.1189@kth.se> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Aug26.123720.1189@kth.se>, ahernandez@kth.se (Anton Hernández) 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. -- Nadia Novak Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------