From csantos@uu.net Tue Jun 20 08:34:45 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uu!csantos From: csantos@uu.net (Callum Santos) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun20.083445.8831@uu.net> Date: Tue, 20 Jun 1995 08:34:45 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- === Callum Santos === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "5 sigma is a discovery. 7 is a question." From sschneider@earthlink.net Tue Jun 20 15:55:45 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!sschneider From: sschneider@earthlink.net (Sergei Schneider) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun20.155545.4023@earthlink.net> Date: Tue, 20 Jun 1995 15:55:45 GMT References: <1995Jun20.083445.8831@uu.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jun20.083445.8831@uu.net>, csantos@uu.net (Callum Santos) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. -- === Sergei Schneider === Dept of Electrical Engineering, EarthLink Network "We don't sign stars. We build them." From keriksson@stanford.edu Wed Jun 21 18:56:45 1995 Path: ashpoly!cascade!bigsur!stanford!keriksson From: keriksson@stanford.edu (Karen Eriksson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun21.185645.5116@stanford.edu> Date: Wed, 21 Jun 1995 18:56:45 GMT References: <1995Jun20.083445.8831@uu.net> <1995Jun20.155545.4023@earthlink.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jun20.155545.4023@earthlink.net>, sschneider@earthlink.net (Sergei Schneider) 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. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Karen Eriksson -- Stanford University Computer Systems Lab "Tape doesn't lie at 02:14. Ears do." From mjohansson@rwth-aachen.de Thu Jun 22 16:15:45 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!mjohansson From: mjohansson@rwth-aachen.de (Mikhail Johansson) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun22.161545.7864@rwth-aachen.de> Date: Thu, 22 Jun 1995 16:15:45 GMT References: <1995Jun20.083445.8831@uu.net> <1995Jun20.155545.4023@earthlink.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Jun20.155545.4023@earthlink.net>, sschneider@earthlink.net (Sergei Schneider) 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. -- Mikhail Johansson -- RWTH Aachen Informatik "Measuring a record you own is listening, not piracy." From lweber@pipeline.com Thu Jun 22 17:31:45 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!lweber From: lweber@pipeline.com (Lucia Weber) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun22.173145.4244@pipeline.com> Date: Thu, 22 Jun 1995 17:31:45 GMT References: <1995Jun20.083445.8831@uu.net> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jun20.083445.8831@uu.net>, csantos@uu.net (Callum Santos) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Lucia Weber -- The Pipeline Internet Network "In theory there is no difference between theory and practice."