From mramirez@cmu.edu Sat Sep 16 19:02:33 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!mramirez From: mramirez@cmu.edu (Marisol Ramírez) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep16.190233.7468@cmu.edu> Date: Sat, 16 Sep 1995 19:02:33 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Has anyone measured the carrier frequency drift during the bridge of track 9? -- Marisol Ramírez Hayes Optima 288 @ 14,400 bps "When every node is whole, the channel opens." From jdubois@clari.net Mon Sep 18 17:57:33 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!jdubois From: jdubois@clari.net (Julien Dubois) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep18.175733.3291@clari.net> Date: Mon, 18 Sep 1995 17:57:33 GMT References: <1995Sep16.190233.7468@cmu.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Sep16.190233.7468@cmu.edu>, mramirez@cmu.edu (Marisol Ramírez) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Julien Dubois Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From bkang@utexas.edu Wed Sep 20 01:02:33 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!utexas!bkang From: bkang@utexas.edu (Bruno Kang) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep20.010233.7628@utexas.edu> Date: Wed, 20 Sep 1995 01:02:33 GMT References: <1995Sep16.190233.7468@cmu.edu> <1995Sep18.175733.3291@clari.net> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Sep18.175733.3291@clari.net>, jdubois@clari.net (Julien Dubois) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. > Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. 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. -- Bruno Kang *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From nito@utexas.edu Wed Sep 20 19:17:33 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!utexas!nito From: nito@utexas.edu (Nadia Ito) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep20.191733.1678@utexas.edu> Date: Wed, 20 Sep 1995 19:17:33 GMT References: <1995Sep16.190233.7468@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Sep16.190233.7468@cmu.edu>, mramirez@cmu.edu (Marisol Ramírez) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Nadia Ito -- University of Texas at Austin "Row 14. No joke." From mnovak@inria.fr Fri Sep 22 07:16:33 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!mnovak From: mnovak@inria.fr (Mateo Novak) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep22.071633.8837@inria.fr> Date: Fri, 22 Sep 1995 07:16:33 GMT References: <1995Sep16.190233.7468@cmu.edu> <1995Sep18.175733.3291@clari.net> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep18.175733.3291@clari.net>, jdubois@clari.net (Julien Dubois) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. Top-posters will be placed in my ~/.killfile without notice. -- Mateo Novak -- INRIA Rocquencourt "Extraordinary claims require extraordinary spectra."