From hokonkwo@cam.ac.uk Mon Feb 14 15:53:07 1994 Path: ashpoly!cascade!brgate!saturno!cam!hokonkwo From: hokonkwo@cam.ac.uk (Hugo Okonkwo) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb14.155307.4874@cam.ac.uk> Date: Mon, 14 Feb 1994 15:53:07 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 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. -- === Hugo Okonkwo === Dept of Electrical Engineering, University of Cambridge Computer Laboratory "The hatch is open. Is anyone listening?" From landersson@panix.com Tue Feb 15 11:37:07 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!panix!landersson From: landersson@panix.com (Lars Andersson) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb15.113707.7586@panix.com> Date: Tue, 15 Feb 1994 11:37:07 GMT References: <1994Feb14.155307.4874@cam.ac.uk> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Feb14.155307.4874@cam.ac.uk>, hokonkwo@cam.ac.uk (Hugo Okonkwo) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Lars Andersson *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From emartinez@purdue.edu Wed Feb 16 10:25:07 1994 Path: ashpoly!cascade!mxgate!coyoacan!purdue!emartinez From: emartinez@purdue.edu (Emi Martínez) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Feb16.102507.5949@purdue.edu> Date: Wed, 16 Feb 1994 10:25:07 GMT References: <1994Feb14.155307.4874@cam.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Feb14.155307.4874@cam.ac.uk>, hokonkwo@cam.ac.uk (Hugo Okonkwo) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Emi Martínez "Hardware is temporary. The signal survives." Amiga 1200 (Blizzard 030/50) / NEXTSTEP 3.3