From hokonkwo@uu.net Thu Jun 20 19:27:53 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!hokonkwo From: hokonkwo@uu.net (Hugo Okonkwo) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun20.192753.9656@uu.net> Date: Thu, 20 Jun 1996 19:27:53 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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. -- === Hugo Okonkwo === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "When every node is whole, the channel opens." From egonzalez@cmu.edu Fri Jun 21 14:52:53 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!egonzalez From: egonzalez@cmu.edu (Élodie González) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun21.145253.2767@cmu.edu> Date: Fri, 21 Jun 1996 14:52:53 GMT References: <1996Jun20.192753.9656@uu.net> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jun20.192753.9656@uu.net>, hokonkwo@uu.net (Hugo Okonkwo) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Élodie González Zyxel U-1496E @ 14,400 bps "They will send a copy in my place." From bvasiliev@earthlink.net Sat Jun 22 19:44:53 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!bvasiliev From: bvasiliev@earthlink.net (Bruno Vasiliev) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun22.194453.9884@earthlink.net> Date: Sat, 22 Jun 1996 19:44:53 GMT References: <1996Jun20.192753.9656@uu.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jun20.192753.9656@uu.net>, hokonkwo@uu.net (Hugo Okonkwo) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > 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. -- Bruno Vasiliev Tape trading list upon request. SASE required for international mail. From apopov@cern.ch Sat Jun 22 20:35:53 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!apopov From: apopov@cern.ch (Astrid Popov) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun22.203553.1907@cern.ch> Date: Sat, 22 Jun 1996 20:35:53 GMT References: <1996Jun20.192753.9656@uu.net> <1996Jun22.194453.9884@earthlink.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1996Jun22.194453.9884@earthlink.net>, bvasiliev@earthlink.net (Bruno Vasiliev) 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. 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Astrid Popov Opinions expressed are solely my own and not those of European Laboratory for Particle Physics, Geneva. ------------------------------------------------------------ From mwatanabe@purdue.edu Mon Jun 24 00:42:53 1996 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!mwatanabe From: mwatanabe@purdue.edu (Min-jun Watanabe) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jun24.004253.8637@purdue.edu> Date: Mon, 24 Jun 1996 00:42:53 GMT References: <1996Jun20.192753.9656@uu.net> <1996Jun21.145253.2767@cmu.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Jun21.145253.2767@cmu.edu>, egonzalez@cmu.edu (Élodie González) writes: > The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Min-jun Watanabe Hayes Optima 288 @ 19,200 bps "Hold for relay."