From ekang@kth.se Sun Jan 01 05:52:55 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!ekang From: ekang@kth.se (Elaine Kang) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan01.055255.7384@kth.se> Date: Sun, 01 Jan 1995 05:52:55 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. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Elaine Kang Zyxel U-1496E @ 28,800 bps "Tape doesn't lie at 02:14. Ears do." From tgirard@inria.fr Sun Jan 01 12:37:55 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!tgirard From: tgirard@inria.fr (Takeshi Girard) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan01.123755.1654@inria.fr> Date: Sun, 01 Jan 1995 12:37:55 GMT References: <1995Jan01.055255.7384@kth.se> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jan01.055255.7384@kth.se>, ekang@kth.se (Elaine Kang) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. -- === Takeshi Girard === Dept of Electrical Engineering, INRIA Rocquencourt "Do not worship the copy." From arobertson@u-tokyo.ac.jp Mon Jan 02 01:31:55 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!u-tokyo!arobertson From: arobertson@u-tokyo.ac.jp (Astrid Robertson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan02.013155.1088@u-tokyo.ac.jp> Date: Mon, 02 Jan 1995 01:31:55 GMT References: <1995Jan01.055255.7384@kth.se> <1995Jan01.123755.1654@inria.fr> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan01.123755.1654@inria.fr>, tgirard@inria.fr (Takeshi Girard) 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. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Astrid Robertson Hayes Optima 288 @ 14,400 bps "A soul is not exclusive to biology." From klopez@pipeline.com Mon Jan 02 10:48:55 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pipeline!klopez From: klopez@pipeline.com (Kenji López) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan02.104855.3797@pipeline.com> Date: Mon, 02 Jan 1995 10:48:55 GMT References: <1995Jan01.055255.7384@kth.se> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jan01.055255.7384@kth.se>, ekang@kth.se (Elaine Kang) 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Kenji López === Dept of Electrical Engineering, The Pipeline Internet Network "There are 14 nodes and only 10 countries. Count again." From hrodriguez@ox.ac.uk Tue Jan 03 23:01:55 1995 Path: ashpoly!cascade!transat!ukc!fennimore!ox!hrodriguez From: hrodriguez@ox.ac.uk (Heather Rodríguez) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jan03.230155.2860@ox.ac.uk> Date: Tue, 03 Jan 1995 23:01:55 GMT References: <1995Jan01.055255.7384@kth.se> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jan01.055255.7384@kth.se>, ekang@kth.se (Elaine Kang) writes: > 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). 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. -- === Heather Rodríguez === Dept of Electrical Engineering, Oxford University Computing Laboratory "Measuring a record you own is listening, not piracy."