From kmacdonald@rwth-aachen.de Thu Dec 15 18:31:32 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!kmacdonald From: kmacdonald@rwth-aachen.de (Katrin MacDonald) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec15.183132.5835@rwth-aachen.de> Date: Thu, 15 Dec 1994 18:31:32 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Katrin MacDonald US Robotics Courier V.34 @ 33,600 bps "There are 14 nodes and only 10 countries. Count again." From msanchez@netcom.com Fri Dec 16 05:01:32 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!netcom!msanchez From: msanchez@netcom.com (Morag Sánchez) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec16.050132.1335@netcom.com> Date: Fri, 16 Dec 1994 05:01:32 GMT References: <1994Dec15.183132.5835@rwth-aachen.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Dec15.183132.5835@rwth-aachen.de>, kmacdonald@rwth-aachen.de (Katrin MacDonald) 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. -- === Morag Sánchez === Dept of Electrical Engineering, NETCOM On-Line Communication Services "When every node is whole, the channel opens." From tsuzuki@utexas.edu Sat Dec 17 21:59:32 1994 Path: ashpoly!cascade!mxgate!coyoacan!utexas!tsuzuki From: tsuzuki@utexas.edu (Tyler Suzuki) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec17.215932.6820@utexas.edu> Date: Sat, 17 Dec 1994 21:59:32 GMT References: <1994Dec15.183132.5835@rwth-aachen.de> <1994Dec16.050132.1335@netcom.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Dec16.050132.1335@netcom.com>, msanchez@netcom.com (Morag Sánchez) writes: > That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- === Tyler Suzuki === Dept of Electrical Engineering, University of Texas at Austin "Row 14. No joke." From gnilsson@inria.fr Sun Dec 18 19:05:32 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!gnilsson From: gnilsson@inria.fr (Göran Nilsson) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec18.190532.1637@inria.fr> Date: Sun, 18 Dec 1994 19:05:32 GMT References: <1994Dec15.183132.5835@rwth-aachen.de> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Dec15.183132.5835@rwth-aachen.de>, kmacdonald@rwth-aachen.de (Katrin MacDonald) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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. -- Göran Nilsson | gnilsson@inria.fr PGP Key fingerprint: B00F 14D3 13FA D75F "Keep the channels open." From cmartinez@u-tokyo.ac.jp Mon Dec 19 19:48:32 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!u-tokyo!cmartinez From: cmartinez@u-tokyo.ac.jp (Callum Martínez) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec19.194832.3235@u-tokyo.ac.jp> Date: Mon, 19 Dec 1994 19:48:32 GMT References: <1994Dec15.183132.5835@rwth-aachen.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Dec15.183132.5835@rwth-aachen.de>, kmacdonald@rwth-aachen.de (Katrin MacDonald) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Callum Martínez Opinions expressed are solely my own and not those of University of Tokyo Department of Information Science. ------------------------------------------------------------