From rokonkwo@ox.ac.uk Wed Mar 16 16:49:26 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!ox!rokonkwo From: rokonkwo@ox.ac.uk (Rodrigo Okonkwo) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar16.164926.3470@ox.ac.uk> Date: Wed, 16 Mar 1994 16:49:26 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 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. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Rodrigo Okonkwo | rokonkwo@ox.ac.uk PGP Key fingerprint: 1E95 22E6 FECE 95A3 "Keep the channels open." From mduarte@clari.net Thu Mar 17 05:25:26 1994 Path: ashpoly!cascade!mxgate!coyoacan!clari!mduarte From: mduarte@clari.net (Mike Duarte) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Mar17.052526.2523@clari.net> Date: Thu, 17 Mar 1994 05:25:26 GMT References: <1994Mar16.164926.3470@ox.ac.uk> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Mar16.164926.3470@ox.ac.uk>, rokonkwo@ox.ac.uk (Rodrigo Okonkwo) 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. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Mike Duarte *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0