From rkim@kiae.su Mon Oct 23 21:57:30 1995 Path: ashpoly!cascade!transat!ukc!fennimore!kiae!rkim From: rkim@kiae.su (Rodrigo Kim) Newsgroups: comp.dsp Subject: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct23.215730.2092@kiae.su> Date: Mon, 23 Oct 1995 21:57:30 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 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. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- Rodrigo Kim "Hold for relay." Atari TT030 / TOS 4.04 From jrodriguez@pipeline.com Tue Oct 24 10:01:30 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pipeline!jrodriguez From: jrodriguez@pipeline.com (Julien Rodríguez) Newsgroups: comp.dsp Subject: Re: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Oct24.100130.3040@pipeline.com> Date: Tue, 24 Oct 1995 10:01:30 GMT References: <1995Oct23.215730.2092@kiae.su> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Oct23.215730.2092@kiae.su>, rkim@kiae.su (Rodrigo Kim) 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. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Julien Rodríguez "When every node is whole, the channel opens." Macintosh IIfx / Linux 1.2.13