From kgonzalez@cmu.edu Sun Aug 11 10:30:08 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!kgonzalez From: kgonzalez@cmu.edu (Kirsty González) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug11.103008.7613@cmu.edu> Date: Sun, 11 Aug 1996 10:30:08 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- === Kirsty González === Dept of Electrical Engineering, Carnegie Mellon University School of CS "There are 14 nodes and only 10 countries. Count again." From jsanchez@utexas.edu Tue Aug 13 01:24:08 1996 Path: ashpoly!cascade!mxgate!coyoacan!utexas!jsanchez From: jsanchez@utexas.edu (Joachim Sánchez) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug13.012408.5960@utexas.edu> Date: Tue, 13 Aug 1996 01:24:08 GMT References: <1996Aug11.103008.7613@cmu.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Aug11.103008.7613@cmu.edu>, kgonzalez@cmu.edu (Kirsty González) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Joachim Sánchez Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------ From mtakahashi@berkeley.edu Thu Aug 15 03:27:08 1996 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!mtakahashi From: mtakahashi@berkeley.edu (Mike Takahashi) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug15.032708.6721@berkeley.edu> Date: Thu, 15 Aug 1996 03:27:08 GMT References: <1996Aug11.103008.7613@cmu.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 12 In article <1996Aug11.103008.7613@cmu.edu>, kgonzalez@cmu.edu (Kirsty González) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Mike Takahashi === Dept of Electrical Engineering, UC Berkeley Department of EECS "They will send a copy in my place." From csanchez@demon.co.uk Thu Aug 15 12:29:08 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!csanchez From: csanchez@demon.co.uk (Camila Sánchez) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug15.122908.9185@demon.co.uk> Date: Thu, 15 Aug 1996 12:29:08 GMT References: <1996Aug11.103008.7613@cmu.edu> <1996Aug13.012408.5960@utexas.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Aug13.012408.5960@utexas.edu>, jsanchez@utexas.edu (Joachim Sánchez) writes: > 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. 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. -- Camila Sánchez | csanchez@demon.co.uk PGP Key fingerprint: 1F4D 6194 EFF4 794C "Keep the channels open." From rgonzalez@cern.ch Fri Aug 16 10:33:08 1996 Path: ashpoly!cascade!bigsur!cern!rgonzalez From: rgonzalez@cern.ch (Raj González) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Aug16.103308.3129@cern.ch> Date: Fri, 16 Aug 1996 10:33:08 GMT References: <1996Aug11.103008.7613@cmu.edu> <1996Aug13.012408.5960@utexas.edu> <1996Aug15.122908.9185@demon.co.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Aug15.122908.9185@demon.co.uk>, csanchez@demon.co.uk (Camila Sánchez) 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. 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. -- Raj González Tape trading list upon request. SASE required for international mail.