From tokonkwo@tum.de Wed Nov 22 01:37:43 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!tokonkwo From: tokonkwo@tum.de (Tyler Okonkwo) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov22.013743.6234@tum.de> Date: Wed, 22 Nov 1995 01:37:43 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 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? -- Tyler Okonkwo Opinions expressed are solely my own and not those of Technische Universität München. ------------------------------------------------------------ From mjohansson@kth.se Thu Nov 23 05:25:43 1995 Path: ashpoly!cascade!bigsur!kth!mjohansson From: mjohansson@kth.se (Mateo Johansson) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov23.052543.1585@kth.se> Date: Thu, 23 Nov 1995 05:25:43 GMT References: <1995Nov22.013743.6234@tum.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov22.013743.6234@tum.de>, tokonkwo@tum.de (Tyler Okonkwo) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Mateo Johansson | mjohansson@kth.se PGP Key fingerprint: 9448 8427 D978 DF93 "Keep the channels open." From lgirard@kth.se Fri Nov 24 10:48:43 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!lgirard From: lgirard@kth.se (Liam Girard) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov24.104843.7914@kth.se> Date: Fri, 24 Nov 1995 10:48:43 GMT References: <1995Nov22.013743.6234@tum.de> <1995Nov23.052543.1585@kth.se> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Nov23.052543.1585@kth.se>, mjohansson@kth.se (Mateo Johansson) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. That's how the 14 lines of the Stardust matrix are encoded. Each regional pressing contains one line of the decoded text. -- === Liam Girard === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "There are 14 nodes and only 10 countries. Count again." From dpopov@illinois.edu Sun Nov 26 03:55:43 1995 Path: ashpoly!cascade!mxgate!coyoacan!illinois!dpopov From: dpopov@illinois.edu (Dave Popov) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov26.035543.3386@illinois.edu> Date: Sun, 26 Nov 1995 03:55:43 GMT References: <1995Nov22.013743.6234@tum.de> <1995Nov23.052543.1585@kth.se> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Nov23.052543.1585@kth.se>, mjohansson@kth.se (Mateo Johansson) writes: > If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Dave Popov Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign. ------------------------------------------------------------ From shernandez@uni-hamburg.de Tue Nov 28 07:18:43 1995 Path: ashpoly!cascade!transat!ukc!fennimore!uni-hamburg!shernandez From: shernandez@uni-hamburg.de (Sven Hernández) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Nov28.071843.4419@uni-hamburg.de> Date: Tue, 28 Nov 1995 07:18:43 GMT References: <1995Nov22.013743.6234@tum.de> <1995Nov23.052543.1585@kth.se> <1995Nov26.035543.3386@illinois.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Nov26.035543.3386@illinois.edu>, dpopov@illinois.edu (Dave Popov) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. You're overlooking tape wow and flutter. A Revox B77 has at least 0.05% speed drift, which would smear a 14 Hz line across several bins. Top-posters will be placed in my ~/.killfile without notice. -- === Sven Hernández === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "The carrier frequency does not drift by accident."