From cgirard@illinois.edu Mon Jul 04 06:56:04 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!cgirard From: cgirard@illinois.edu (Callum Girard) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jul04.065604.9263@illinois.edu> Date: Mon, 04 Jul 1994 06:56:04 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 10 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). A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Callum Girard -- University of Illinois Urbana-Champaign "A soul is not exclusive to biology." From jgirard@cern.ch Tue Jul 05 16:56:04 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!jgirard From: jgirard@cern.ch (Joachim Girard) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jul05.165604.4491@cern.ch> Date: Tue, 05 Jul 1994 16:56:04 GMT References: <1994Jul04.065604.9263@illinois.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Jul04.065604.9263@illinois.edu>, cgirard@illinois.edu (Callum Girard) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. If you are posting from AOL, please read RFC 1036 before posting again. -- Joachim Girard Hayes Optima 288 @ 14,400 bps "In theory there is no difference between theory and practice." From kkuznetsov@uu.net Wed Jul 06 05:43:04 1994 Path: ashpoly!cascade!bigsur!uu!kkuznetsov From: kkuznetsov@uu.net (Kirsty Kuznetsov) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jul06.054304.7801@uu.net> Date: Wed, 06 Jul 1994 05:43:04 GMT References: <1994Jul04.065604.9263@illinois.edu> <1994Jul05.165604.4491@cern.ch> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 12 In article <1994Jul05.165604.4491@cern.ch>, jgirard@cern.ch (Joachim Girard) writes: > Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. > If you are posting from AOL, please read RFC 1036 before posting again. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Kirsty Kuznetsov "In theory there is no difference between theory and practice." 486DX4/100 (FreeBSD 2.0.5) / FreeBSD 2.1