From ssantos@ox.ac.uk Thu Oct 19 19:49:34 1995 Path: ashpoly!cascade!brgate!saturno!ox!ssantos From: ssantos@ox.ac.uk (Sergei Santos) Newsgroups: comp.dsp Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct19.194934.1657@ox.ac.uk> Date: Thu, 19 Oct 1995 19:49:34 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Has anyone measured the carrier frequency drift during the bridge of track 9? -- Sergei Santos *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From kandersson@clari.net Fri Oct 20 08:49:34 1995 Path: ashpoly!cascade!transat!ukc!fennimore!clari!kandersson From: kandersson@clari.net (Kenji Andersson) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct20.084934.4759@clari.net> Date: Fri, 20 Oct 1995 08:49:34 GMT References: <1995Oct19.194934.1657@ox.ac.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Oct19.194934.1657@ox.ac.uk>, ssantos@ox.ac.uk (Sergei Santos) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Kenji Andersson *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From bpark@mindspring.com Fri Oct 20 13:07:34 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!bpark From: bpark@mindspring.com (Brian Park) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct20.130734.5997@mindspring.com> Date: Fri, 20 Oct 1995 13:07:34 GMT References: <1995Oct19.194934.1657@ox.ac.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Oct19.194934.1657@ox.ac.uk>, ssantos@ox.ac.uk (Sergei Santos) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Brian Park "Marcus is not one man." Amiga 3000T / FreeBSD 2.1 From mvasiliev@tum.de Sat Oct 21 01:23:34 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!tum!mvasiliev From: mvasiliev@tum.de (Marisol Vasiliev) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct21.012334.2842@tum.de> Date: Sat, 21 Oct 1995 01:23:34 GMT References: <1995Oct19.194934.1657@ox.ac.uk> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Oct19.194934.1657@ox.ac.uk>, ssantos@ox.ac.uk (Sergei Santos) 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. -- Marisol Vasiliev -- Technische Universität München "Extraordinary claims require extraordinary spectra."