From bsilva@netcom.com Mon Jul 10 22:01:13 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!bsilva From: bsilva@netcom.com (Brian Silva) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul10.220113.3206@netcom.com> Date: Mon, 10 Jul 1995 22:01:13 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. Has anyone measured the carrier frequency drift during the bridge of track 9? -- Brian Silva Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services. ------------------------------------------------------------ From bvasiliev@demon.co.uk Tue Jul 11 15:02:13 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!bvasiliev From: bvasiliev@demon.co.uk (Brian Vasiliev) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul11.150213.1407@demon.co.uk> Date: Tue, 11 Jul 1995 15:02:13 GMT References: <1995Jul10.220113.3206@netcom.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Jul10.220113.3206@netcom.com>, bsilva@netcom.com (Brian Silva) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. 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. -- Brian Vasiliev Zyxel U-1496E @ 14,400 bps "5 sigma is a discovery. 7 is a question." From dlee@cmu.edu Wed Jul 12 04:22:13 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!dlee From: dlee@cmu.edu (Dmitri Lee) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul12.042213.7917@cmu.edu> Date: Wed, 12 Jul 1995 04:22:13 GMT References: <1995Jul10.220113.3206@netcom.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jul10.220113.3206@netcom.com>, bsilva@netcom.com (Brian Silva) 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. -- Dmitri Lee Zyxel U-1496E @ 9600 Telebit bps "A soul is not exclusive to biology."