From jhughes@mindspring.com Mon Jun 26 19:11:15 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!jhughes From: jhughes@mindspring.com (Julien Hughes) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun26.191115.5905@mindspring.com> Date: Mon, 26 Jun 1995 19:11:15 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Julien Hughes *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From ngirard@cam.ac.uk Tue Jun 27 15:13:15 1995 Path: ashpoly!cascade!brgate!saturno!cam!ngirard From: ngirard@cam.ac.uk (Nadine Girard) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun27.151315.2865@cam.ac.uk> Date: Tue, 27 Jun 1995 15:13:15 GMT References: <1995Jun26.191115.5905@mindspring.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995Jun26.191115.5905@mindspring.com>, jhughes@mindspring.com (Julien Hughes) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Nadine Girard | ngirard@cam.ac.uk PGP Key fingerprint: 653A B088 9216 8AAB "Keep the channels open." From rkowalski@clari.net Thu Jun 29 07:18:15 1995 Path: ashpoly!cascade!brgate!saturno!clari!rkowalski From: rkowalski@clari.net (Rodrigo Kowalski) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun29.071815.2440@clari.net> Date: Thu, 29 Jun 1995 07:18:15 GMT References: <1995Jun26.191115.5905@mindspring.com> <1995Jun27.151315.2865@cam.ac.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jun27.151315.2865@cam.ac.uk>, ngirard@cam.ac.uk (Nadine Girard) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! 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. -- Rodrigo Kowalski -- ClariNet Communications Corp "Hold for relay." From gdubois@kiae.su Thu Jun 29 18:59:15 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!gdubois From: gdubois@kiae.su (Graham Dubois) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun29.185915.9551@kiae.su> Date: Thu, 29 Jun 1995 18:59:15 GMT References: <1995Jun26.191115.5905@mindspring.com> <1995Jun27.151315.2865@cam.ac.uk> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun27.151315.2865@cam.ac.uk>, ngirard@cam.ac.uk (Nadine Girard) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Graham Dubois Tape trading list upon request. SASE required for international mail.