From tstewart@ox.ac.uk Sun Jun 11 18:20:46 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!tstewart From: tstewart@ox.ac.uk (Tobias Stewart) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun11.182046.7683@ox.ac.uk> Date: Sun, 11 Jun 1995 18:20:46 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. 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). The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- === Tobias Stewart === Dept of Electrical Engineering, Oxford University Computing Laboratory "Do not worship the copy." From tito@ox.ac.uk Mon Jun 12 05:19:46 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!tito From: tito@ox.ac.uk (Tobias Ito) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun12.051946.6099@ox.ac.uk> Date: Mon, 12 Jun 1995 05:19:46 GMT References: <1995Jun11.182046.7683@ox.ac.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jun11.182046.7683@ox.ac.uk>, tstewart@ox.ac.uk (Tobias Stewart) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. 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. -- Tobias Ito Tape trading list upon request. SASE required for international mail. From jstewart@ox.ac.uk Mon Jun 12 20:34:46 1995 Path: ashpoly!cascade!mxgate!coyoacan!ox!jstewart From: jstewart@ox.ac.uk (Ji-woo Stewart) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun12.203446.4082@ox.ac.uk> Date: Mon, 12 Jun 1995 20:34:46 GMT References: <1995Jun11.182046.7683@ox.ac.uk> <1995Jun12.051946.6099@ox.ac.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun12.051946.6099@ox.ac.uk>, tito@ox.ac.uk (Tobias Ito) writes: > 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. 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. -- Ji-woo Stewart *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0