From gandersson@rwth-aachen.de Wed Oct 25 00:37:38 1995 Path: ashpoly!cascade!bigsur!rwth-aachen!gandersson From: gandersson@rwth-aachen.de (Göran Andersson) Newsgroups: comp.dsp Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct25.003738.1499@rwth-aachen.de> Date: Wed, 25 Oct 1995 00:37:38 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Göran Andersson *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From dmartinez@netcom.com Thu Oct 26 18:27:38 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!dmartinez From: dmartinez@netcom.com (Dave Martínez) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct26.182738.3038@netcom.com> Date: Thu, 26 Oct 1995 18:27:38 GMT References: <1995Oct25.003738.1499@rwth-aachen.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Oct25.003738.1499@rwth-aachen.de>, gandersson@rwth-aachen.de (Göran Andersson) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Dave Martínez *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From dtanaka@netcom.com Sat Oct 28 06:02:38 1995 Path: ashpoly!cascade!mxgate!coyoacan!netcom!dtanaka From: dtanaka@netcom.com (Dmitri Tanaka) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct28.060238.4834@netcom.com> Date: Sat, 28 Oct 1995 06:02:38 GMT References: <1995Oct25.003738.1499@rwth-aachen.de> <1995Oct26.182738.3038@netcom.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Oct26.182738.3038@netcom.com>, dmartinez@netcom.com (Dave Martínez) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. 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. PGP Public key available via finger or upon request. -- Dmitri Tanaka | dtanaka@netcom.com PGP Key fingerprint: FF83 53A6 EBD4 A8D8 "Keep the channels open." From ksouza@pacbell.net Sun Oct 29 03:59:38 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!ksouza From: ksouza@pacbell.net (Katrin Souza) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct29.035938.8868@pacbell.net> Date: Sun, 29 Oct 1995 03:59:38 GMT References: <1995Oct25.003738.1499@rwth-aachen.de> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Oct25.003738.1499@rwth-aachen.de>, gandersson@rwth-aachen.de (Göran Andersson) 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Katrin Souza Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------ From otanaka@illinois.edu Sun Oct 29 16:03:38 1995 Path: ashpoly!cascade!bigsur!illinois!otanaka From: otanaka@illinois.edu (Olga Tanaka) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct29.160338.3791@illinois.edu> Date: Sun, 29 Oct 1995 16:03:38 GMT References: <1995Oct25.003738.1499@rwth-aachen.de> <1995Oct26.182738.3038@netcom.com> <1995Oct28.060238.4834@netcom.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Oct28.060238.4834@netcom.com>, dtanaka@netcom.com (Dmitri Tanaka) writes: > 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. > PGP Public key available via finger or upon request. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Olga Tanaka *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0