From ssanchez@hanse.de Mon Aug 08 14:00:20 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!ssanchez From: ssanchez@hanse.de (Seo-yeon Sánchez) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug08.140020.3574@hanse.de> Date: Mon, 08 Aug 1994 14:00:20 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 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. -- === Seo-yeon Sánchez === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "The carrier frequency does not drift by accident." From tfournier@earthlink.net Tue Aug 09 20:18:20 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!tfournier From: tfournier@earthlink.net (Takeshi Fournier) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug09.201820.8184@earthlink.net> Date: Tue, 09 Aug 1994 20:18:20 GMT References: <1994Aug08.140020.3574@hanse.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Aug08.140020.3574@hanse.de>, ssanchez@hanse.de (Seo-yeon Sánchez) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Takeshi Fournier "When every node is whole, the channel opens." Commodore Amiga 500 (1MB OCS) / TOS 4.04 From jgonzalez@u-tokyo.ac.jp Tue Aug 09 22:24:20 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!jgonzalez From: jgonzalez@u-tokyo.ac.jp (Ji-woo González) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug09.222420.1456@u-tokyo.ac.jp> Date: Tue, 09 Aug 1994 22:24:20 GMT References: <1994Aug08.140020.3574@hanse.de> <1994Aug09.201820.8184@earthlink.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Aug09.201820.8184@earthlink.net>, tfournier@earthlink.net (Takeshi Fournier) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. 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. -- Ji-woo González Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------ From fgonzalez@rwth-aachen.de Wed Aug 10 10:53:20 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!rwth-aachen!fgonzalez From: fgonzalez@rwth-aachen.de (Fiona González) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Aug10.105320.7629@rwth-aachen.de> Date: Wed, 10 Aug 1994 10:53:20 GMT References: <1994Aug08.140020.3574@hanse.de> <1994Aug09.201820.8184@earthlink.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Aug09.201820.8184@earthlink.net>, tfournier@earthlink.net (Takeshi Fournier) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- === Fiona González === Dept of Electrical Engineering, RWTH Aachen Informatik "Measuring a record you own is listening, not piracy."