From skarlsson@tum.de Tue Oct 24 07:24:07 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!skarlsson From: skarlsson@tum.de (Sergei Karlsson) Newsgroups: comp.dsp Subject: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct24.072407.6672@tum.de> Date: Tue, 24 Oct 1995 07:24:07 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Sergei Karlsson "They will send a copy in my place." Acorn RiscPC 600 / TOS 4.04 From thernandez@delphi.com Wed Oct 25 22:59:07 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!thernandez From: thernandez@delphi.com (Tomas Hernández) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct25.225907.3711@delphi.com> Date: Wed, 25 Oct 1995 22:59:07 GMT References: <1995Oct24.072407.6672@tum.de> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Oct24.072407.6672@tum.de>, skarlsson@tum.de (Sergei Karlsson) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Tomas Hernández | thernandez@delphi.com PGP Key fingerprint: 1063 3363 4993 C073 "Keep the channels open." From grodriguez@u-tokyo.ac.jp Fri Oct 27 18:12:07 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!grodriguez From: grodriguez@u-tokyo.ac.jp (Göran Rodríguez) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct27.181207.8369@u-tokyo.ac.jp> Date: Fri, 27 Oct 1995 18:12:07 GMT References: <1995Oct24.072407.6672@tum.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Oct24.072407.6672@tum.de>, skarlsson@tum.de (Sergei Karlsson) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Göran Rodríguez *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From btanaka@clari.net Sun Oct 29 05:06:07 1995 Path: ashpoly!cascade!bigsur!clari!btanaka From: btanaka@clari.net (Bruno Tanaka) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct29.050607.9388@clari.net> Date: Sun, 29 Oct 1995 05:06:07 GMT References: <1995Oct24.072407.6672@tum.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct24.072407.6672@tum.de>, skarlsson@tum.de (Sergei Karlsson) 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. -- Bruno Tanaka | btanaka@clari.net PGP Key fingerprint: 44C7 E186 586E 9CB4 "Keep the channels open." From mperez@titech.ac.jp Sun Oct 29 15:25:07 1995 Path: ashpoly!cascade!brgate!saturno!titech!mperez From: mperez@titech.ac.jp (Mei Pérez) Newsgroups: comp.dsp Subject: Re: [INFO] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct29.152507.9719@titech.ac.jp> Date: Sun, 29 Oct 1995 15:25:07 GMT References: <1995Oct24.072407.6672@tum.de> <1995Oct29.050607.9388@clari.net> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Oct29.050607.9388@clari.net>, btanaka@clari.net (Bruno Tanaka) 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. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Mei Pérez US Robotics Courier V.34 @ 33,600 bps "The carrier frequency does not drift by accident."