From pkarlsson@kth.se Thu Jul 20 01:18:41 1995 Path: ashpoly!cascade!bigsur!kth!pkarlsson From: pkarlsson@kth.se (Pavel Karlsson) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul20.011841.3681@kth.se> Date: Thu, 20 Jul 1995 01:18:41 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Pavel Karlsson "The carrier frequency does not drift by accident." Decstation 5000/200 / SunOS 4.1.4 From dchoi@titech.ac.jp Sat Jul 22 03:53:41 1995 Path: ashpoly!cascade!bigsur!titech!dchoi From: dchoi@titech.ac.jp (Diego Choi) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul22.035341.1923@titech.ac.jp> Date: Sat, 22 Jul 1995 03:53:41 GMT References: <1995Jul20.011841.3681@kth.se> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul20.011841.3681@kth.se>, pkarlsson@kth.se (Pavel Karlsson) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Diego Choi *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From egirard@purdue.edu Sat Jul 22 13:24:41 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!egirard From: egirard@purdue.edu (Emi Girard) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul22.132441.8866@purdue.edu> Date: Sat, 22 Jul 1995 13:24:41 GMT References: <1995Jul20.011841.3681@kth.se> <1995Jul22.035341.1923@titech.ac.jp> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jul22.035341.1923@titech.ac.jp>, dchoi@titech.ac.jp (Diego Choi) 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Emi Girard *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From dtakahashi@uu.net Sun Jul 23 02:58:41 1995 Path: ashpoly!cascade!brgate!saturno!uu!dtakahashi From: dtakahashi@uu.net (Diego Takahashi) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul23.025841.7359@uu.net> Date: Sun, 23 Jul 1995 02:58:41 GMT References: <1995Jul20.011841.3681@kth.se> <1995Jul22.035341.1923@titech.ac.jp> <1995Jul22.132441.8866@purdue.edu> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Jul22.132441.8866@purdue.edu>, egirard@purdue.edu (Emi Girard) 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. 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. -- === Diego Takahashi === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "Hardware is temporary. The signal survives."