From nsokolov@purdue.edu Mon Jun 06 10:02:31 1994 Path: ashpoly!cascade!mxgate!coyoacan!purdue!nsokolov From: nsokolov@purdue.edu (Nadine Sokolov) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun06.100231.6923@purdue.edu> Date: Mon, 06 Jun 1994 10:02:31 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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. -- Nadine Sokolov "Tape doesn't lie at 02:14. Ears do." Atari Falcon 030 / System 7.5.1 From hlee@kiae.su Wed Jun 08 04:23:31 1994 Path: ashpoly!cascade!transat!ukc!fennimore!kiae!hlee From: hlee@kiae.su (Hugo Lee) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun08.042331.3507@kiae.su> Date: Wed, 08 Jun 1994 04:23:31 GMT References: <1994Jun06.100231.6923@purdue.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jun06.100231.6923@purdue.edu>, nsokolov@purdue.edu (Nadine Sokolov) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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. -- Hugo Lee SupraFAXModem 28.8 @ 28,800 bps "Row 14. No joke." From mgonzalez@cern.ch Fri Jun 10 01:14:31 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!mgonzalez From: mgonzalez@cern.ch (Marta González) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Jun10.011431.8533@cern.ch> Date: Fri, 10 Jun 1994 01:14:31 GMT References: <1994Jun06.100231.6923@purdue.edu> <1994Jun08.042331.3507@kiae.su> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jun08.042331.3507@kiae.su>, hlee@kiae.su (Hugo Lee) writes: > 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. 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Marta González -- European Laboratory for Particle Physics, Geneva "5 sigma is a discovery. 7 is a question."