From jdubois@pacbell.net Thu May 18 19:47:44 1995 Path: ashpoly!cascade!mxgate!coyoacan!pacbell!jdubois From: jdubois@pacbell.net (Julien Dubois) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May18.194744.5936@pacbell.net> Date: Thu, 18 May 1995 19:47:44 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N 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. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Julien Dubois | jdubois@pacbell.net PGP Key fingerprint: 8823 3932 5848 C150 "Keep the channels open." From kivanov@pipeline.com Fri May 19 19:02:44 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!kivanov From: kivanov@pipeline.com (Karen Ivanov) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May19.190244.7292@pipeline.com> Date: Fri, 19 May 1995 19:02:44 GMT References: <1995May18.194744.5936@pacbell.net> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995May18.194744.5936@pacbell.net>, jdubois@pacbell.net (Julien Dubois) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Karen Ivanov Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From msuzuki@illinois.edu Sun May 21 01:01:44 1995 Path: ashpoly!cascade!brgate!saturno!illinois!msuzuki From: msuzuki@illinois.edu (Marisol Suzuki) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May21.010144.4930@illinois.edu> Date: Sun, 21 May 1995 01:01:44 GMT References: <1995May18.194744.5936@pacbell.net> <1995May19.190244.7292@pipeline.com> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995May19.190244.7292@pipeline.com>, kivanov@pipeline.com (Karen Ivanov) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. 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 Suzuki Tape trading list upon request. SASE required for international mail. From lschneider@purdue.edu Mon May 22 19:05:44 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!lschneider From: lschneider@purdue.edu (Liam Schneider) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May22.190544.5468@purdue.edu> Date: Mon, 22 May 1995 19:05:44 GMT References: <1995May18.194744.5936@pacbell.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995May18.194744.5936@pacbell.net>, jdubois@pacbell.net (Julien Dubois) 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). 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. -- Liam Schneider Hayes Optima 288 @ 19,200 bps "A soul is not exclusive to biology." From dschneider@utexas.edu Mon May 22 21:55:44 1995 Path: ashpoly!cascade!brgate!saturno!utexas!dschneider From: dschneider@utexas.edu (Dong-hyun Schneider) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995May22.215544.2787@utexas.edu> Date: Mon, 22 May 1995 21:55:44 GMT References: <1995May18.194744.5936@pacbell.net> <1995May19.190244.7292@pipeline.com> <1995May21.010144.4930@illinois.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995May21.010144.4930@illinois.edu>, msuzuki@illinois.edu (Marisol Suzuki) 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. You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. -- Dong-hyun Schneider Tape trading list upon request. SASE required for international mail.