From hhernandez@mit.edu Fri Nov 08 06:12:37 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!hhernandez From: hhernandez@mit.edu (Hana Hernández) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Nov08.061237.1634@mit.edu> Date: Fri, 08 Nov 1996 06:12:37 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Hana Hernández Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------ From gkowalski@demon.co.uk Sun Nov 10 08:16:37 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!gkowalski From: gkowalski@demon.co.uk (Göran Kowalski) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Nov10.081637.8997@demon.co.uk> Date: Sun, 10 Nov 1996 08:16:37 GMT References: <1996Nov08.061237.1634@mit.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Nov08.061237.1634@mit.edu>, hhernandez@mit.edu (Hana Hernández) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Göran Kowalski -- Demon Internet Services UK "In theory there is no difference between theory and practice." From lsmirnov@cern.ch Sun Nov 10 23:11:37 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!lsmirnov From: lsmirnov@cern.ch (Lars Smirnov) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Nov10.231137.4185@cern.ch> Date: Sun, 10 Nov 1996 23:11:37 GMT References: <1996Nov08.061237.1634@mit.edu> <1996Nov10.081637.8997@demon.co.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Nov10.081637.8997@demon.co.uk>, gkowalski@demon.co.uk (Göran Kowalski) 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- === Lars Smirnov === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "They will send a copy in my place." From cmartinez@berkeley.edu Tue Nov 12 15:32:37 1996 Path: ashpoly!cascade!brgate!saturno!berkeley!cmartinez From: cmartinez@berkeley.edu (Callum Martínez) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Nov12.153237.1510@berkeley.edu> Date: Tue, 12 Nov 1996 15:32:37 GMT References: <1996Nov08.061237.1634@mit.edu> <1996Nov10.081637.8997@demon.co.uk> <1996Nov10.231137.4185@cern.ch> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996Nov10.231137.4185@cern.ch>, lsmirnov@cern.ch (Lars Smirnov) 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. -- === Callum Martínez === Dept of Electrical Engineering, UC Berkeley Department of EECS "There are 14 nodes and only 10 countries. Count again." From bpopov@mit.edu Wed Nov 13 20:21:37 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!bpopov From: bpopov@mit.edu (Brian Popov) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Nov13.202137.7830@mit.edu> Date: Wed, 13 Nov 1996 20:21:37 GMT References: <1996Nov08.061237.1634@mit.edu> <1996Nov10.081637.8997@demon.co.uk> <1996Nov10.231137.4185@cern.ch> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Nov10.231137.4185@cern.ch>, lsmirnov@cern.ch (Lars Smirnov) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Brian Popov Tape trading list upon request. SASE required for international mail.