From ecampbell@kiae.su Sat Jun 03 21:42:30 1995 Path: ashpoly!cascade!mxgate!coyoacan!kiae!ecampbell From: ecampbell@kiae.su (Elaine Campbell) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun03.214230.5989@kiae.su> Date: Sat, 03 Jun 1995 21:42:30 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 10 Technical analysis of the sub-audible carrier: data and MATLAB code below. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Elaine Campbell Tape trading list upon request. SASE required for international mail. From adubois@kiae.su Mon Jun 05 21:07:30 1995 Path: ashpoly!cascade!brgate!saturno!kiae!adubois From: adubois@kiae.su (Anja Dubois) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun05.210730.3175@kiae.su> Date: Mon, 05 Jun 1995 21:07:30 GMT References: <1995Jun03.214230.5989@kiae.su> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jun03.214230.5989@kiae.su>, ecampbell@kiae.su (Elaine Campbell) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Anja Dubois | adubois@kiae.su PGP Key fingerprint: B006 B68A CA6C 182F "Keep the channels open." From bkowalski@kth.se Wed Jun 07 18:13:30 1995 Path: ashpoly!cascade!bigsur!kth!bkowalski From: bkowalski@kth.se (Brian Kowalski) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun07.181330.4871@kth.se> Date: Wed, 07 Jun 1995 18:13:30 GMT References: <1995Jun03.214230.5989@kiae.su> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jun03.214230.5989@kiae.su>, ecampbell@kiae.su (Elaine Campbell) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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. -- Brian Kowalski "Hold for relay." 486DX4/100 (FreeBSD 2.0.5) / AmigaOS 3.1