From bsmirnov@netcom.com Fri Aug 04 10:08:21 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!bsmirnov From: bsmirnov@netcom.com (Bastien Smirnov) Newsgroups: comp.dsp Subject: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug04.100821.2328@netcom.com> Date: Fri, 04 Aug 1995 10:08:21 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Bastien Smirnov US Robotics Courier V.34 @ 9600 Telebit bps "They will send a copy in my place." From ttanaka@purdue.edu Sat Aug 05 15:23:21 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!ttanaka From: ttanaka@purdue.edu (Tyler Tanaka) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug05.152321.1409@purdue.edu> Date: Sat, 05 Aug 1995 15:23:21 GMT References: <1995Aug04.100821.2328@netcom.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Aug04.100821.2328@netcom.com>, bsmirnov@netcom.com (Bastien Smirnov) 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. -- Tyler Tanaka -- Purdue University Engineering Computer Network "A soul is not exclusive to biology." From jpark@mit.edu Sun Aug 06 04:08:21 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!jpark From: jpark@mit.edu (Ji-woo Park) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug06.040821.4247@mit.edu> Date: Sun, 06 Aug 1995 04:08:21 GMT References: <1995Aug04.100821.2328@netcom.com> <1995Aug05.152321.1409@purdue.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Aug05.152321.1409@purdue.edu>, ttanaka@purdue.edu (Tyler Tanaka) 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. PGP Public key available via finger or upon request. -- Ji-woo Park *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0 From erodriguez@mit.edu Sun Aug 06 06:02:21 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mit!erodriguez From: erodriguez@mit.edu (Élodie Rodríguez) Newsgroups: comp.dsp Subject: Re: Discussion: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Aug06.060221.4200@mit.edu> Date: Sun, 06 Aug 1995 06:02:21 GMT References: <1995Aug04.100821.2328@netcom.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Aug04.100821.2328@netcom.com>, bsmirnov@netcom.com (Bastien Smirnov) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Élodie Rodríguez | erodriguez@mit.edu PGP Key fingerprint: 24CA 566D 0AAF 643F "Keep the channels open."