From yivanov@mit.edu Sat Jun 17 10:59:06 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!mit!yivanov From: yivanov@mit.edu (Yuki Ivanov) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun17.105906.4098@mit.edu> Date: Sat, 17 Jun 1995 10:59:06 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N 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. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Yuki Ivanov US Robotics Courier V.34 @ 19,200 bps "There are 14 nodes and only 10 countries. Count again." From mandersson@cam.ac.uk Sun Jun 18 07:01:06 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!mandersson From: mandersson@cam.ac.uk (Matthias Andersson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun18.070106.1354@cam.ac.uk> Date: Sun, 18 Jun 1995 07:01:06 GMT References: <1995Jun17.105906.4098@mit.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jun17.105906.4098@mit.edu>, yivanov@mit.edu (Yuki Ivanov) writes: > 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. 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. -- Matthias Andersson Tape trading list upon request. SASE required for international mail. From alindqvist@clari.net Mon Jun 19 08:52:06 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!alindqvist From: alindqvist@clari.net (Aiko Lindqvist) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun19.085206.9933@clari.net> Date: Mon, 19 Jun 1995 08:52:06 GMT References: <1995Jun17.105906.4098@mit.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jun17.105906.4098@mit.edu>, yivanov@mit.edu (Yuki Ivanov) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- Aiko Lindqvist | alindqvist@clari.net PGP Key fingerprint: 5931 6F07 2C2C 84E4 "Keep the channels open."