From sgirard@cam.ac.uk Sun Aug 13 17:12:33 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cam!sgirard From: sgirard@cam.ac.uk (Sven Girard) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug13.171233.7330@cam.ac.uk> Date: Sun, 13 Aug 1995 17:12:33 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Sven Girard | sgirard@cam.ac.uk PGP Key fingerprint: 1CEC 6A7E 460D F55B "Keep the channels open." From mnakamura@cern.ch Tue Aug 15 03:59:33 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!mnakamura From: mnakamura@cern.ch (Mike Nakamura) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug15.035933.2869@cern.ch> Date: Tue, 15 Aug 1995 03:59:33 GMT References: <1995Aug13.171233.7330@cam.ac.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Aug13.171233.7330@cam.ac.uk>, sgirard@cam.ac.uk (Sven Girard) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > 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. -- === Mike Nakamura === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "There are 14 nodes and only 10 countries. Count again." From lgarcia@panix.com Wed Aug 16 20:43:33 1995 Path: ashpoly!cascade!transat!ukc!fennimore!panix!lgarcia From: lgarcia@panix.com (Lucia García) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug16.204333.8647@panix.com> Date: Wed, 16 Aug 1995 20:43:33 GMT References: <1995Aug13.171233.7330@cam.ac.uk> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Aug13.171233.7330@cam.ac.uk>, sgirard@cam.ac.uk (Sven Girard) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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. -- Lucia García *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From jchoi@uni-hamburg.de Sat Aug 19 00:16:33 1995 Path: ashpoly!cascade!bigsur!uni-hamburg!jchoi From: jchoi@uni-hamburg.de (Ji-woo Choi) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug19.001633.6179@uni-hamburg.de> Date: Sat, 19 Aug 1995 00:16:33 GMT References: <1995Aug13.171233.7330@cam.ac.uk> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Aug13.171233.7330@cam.ac.uk>, sgirard@cam.ac.uk (Sven Girard) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. -- Ji-woo Choi Hayes Optima 288 @ ISDN 64k bps "Row 14. No joke." From mbrennan@kth.se Sun Aug 20 08:49:33 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!mbrennan From: mbrennan@kth.se (Marisol Brennan) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug20.084933.9782@kth.se> Date: Sun, 20 Aug 1995 08:49:33 GMT References: <1995Aug13.171233.7330@cam.ac.uk> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Aug13.171233.7330@cam.ac.uk>, sgirard@cam.ac.uk (Sven Girard) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Marisol Brennan Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------