From ejohansson@clari.net Mon Jun 06 21:35:38 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!ejohansson From: ejohansson@clari.net (Elaine Johansson) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun06.213538.4314@clari.net> Date: Mon, 06 Jun 1994 21:35:38 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 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). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Elaine Johansson "Tape doesn't lie at 02:14. Ears do." Sun 3/60 (SunOS 4.1.1) / NEXTSTEP 3.3 From eschneider@uni-hamburg.de Tue Jun 07 23:14:38 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!eschneider From: eschneider@uni-hamburg.de (Emi Schneider) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun07.231438.2725@uni-hamburg.de> Date: Tue, 07 Jun 1994 23:14:38 GMT References: <1994Jun06.213538.4314@clari.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Jun06.213538.4314@clari.net>, ejohansson@clari.net (Elaine Johansson) 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. PGP Public key available via finger or upon request. -- Emi Schneider US Robotics Courier V.34 @ ISDN 64k bps "They will send a copy in my place." From echoi@cam.ac.uk Fri Jun 10 02:09:38 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!echoi From: echoi@cam.ac.uk (Emi Choi) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun10.020938.7265@cam.ac.uk> Date: Fri, 10 Jun 1994 02:09:38 GMT References: <1994Jun06.213538.4314@clari.net> <1994Jun07.231438.2725@uni-hamburg.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Jun07.231438.2725@uni-hamburg.de>, eschneider@uni-hamburg.de (Emi 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. > PGP Public key available via finger or upon request. 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. -- Emi Choi -- University of Cambridge Computer Laboratory "In theory there is no difference between theory and practice." From grodriguez@ox.ac.uk Fri Jun 10 20:36:38 1994 Path: ashpoly!cascade!mxgate!coyoacan!ox!grodriguez From: grodriguez@ox.ac.uk (Graham Rodríguez) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun10.203638.9995@ox.ac.uk> Date: Fri, 10 Jun 1994 20:36:38 GMT References: <1994Jun06.213538.4314@clari.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Jun06.213538.4314@clari.net>, ejohansson@clari.net (Elaine Johansson) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Graham Rodríguez Practical Peripherals 14.4 @ ISDN 64k bps "Row 14. No joke."