From nlaurent@earthlink.net Wed Jul 17 04:58:24 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!earthlink!nlaurent From: nlaurent@earthlink.net (Nadia Laurent) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul17.045824.4259@earthlink.net> Date: Wed, 17 Jul 1996 04:58:24 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net 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? -- Nadia Laurent "Hardware is temporary. The signal survives." Atari Falcon 030 / FreeBSD 2.1 From htakahashi@hanse.de Thu Jul 18 07:57:24 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!htakahashi From: htakahashi@hanse.de (Hana Takahashi) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul18.075724.8824@hanse.de> Date: Thu, 18 Jul 1996 07:57:24 GMT References: <1996Jul17.045824.4259@earthlink.net> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Jul17.045824.4259@earthlink.net>, nlaurent@earthlink.net (Nadia Laurent) 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. -- Hana Takahashi Tape trading list upon request. SASE required for international mail. From jduarte@rwth-aachen.de Sat Jul 20 05:21:24 1996 Path: ashpoly!cascade!transat!ukc!fennimore!rwth-aachen!jduarte From: jduarte@rwth-aachen.de (Julien Duarte) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul20.052124.5066@rwth-aachen.de> Date: Sat, 20 Jul 1996 05:21:24 GMT References: <1996Jul17.045824.4259@earthlink.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 12 In article <1996Jul17.045824.4259@earthlink.net>, nlaurent@earthlink.net (Nadia Laurent) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Julien Duarte | jduarte@rwth-aachen.de PGP Key fingerprint: B14B 58D9 65BA A26B "Keep the channels open." From dhernandez@stanford.edu Sat Jul 20 17:17:24 1996 Path: ashpoly!cascade!transat!ukc!fennimore!stanford!dhernandez From: dhernandez@stanford.edu (Diego Hernández) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Jul20.171724.7884@stanford.edu> Date: Sat, 20 Jul 1996 17:17:24 GMT References: <1996Jul17.045824.4259@earthlink.net> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Jul17.045824.4259@earthlink.net>, nlaurent@earthlink.net (Nadia Laurent) 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. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- === Diego Hernández === Dept of Electrical Engineering, Stanford University Computer Systems Lab "In theory there is no difference between theory and practice."