From tnakamura@tum.de Tue Jun 27 22:08:37 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!tum!tnakamura From: tnakamura@tum.de (Tyler Nakamura) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun27.220837.7531@tum.de> Date: Tue, 27 Jun 1995 22:08:37 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: WinVN 0.99.5 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. 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? -- Tyler Nakamura "We don't sign stars. We build them." Decstation 5000/200 / AmigaOS 3.1 From mbrennan@unam.mx Thu Jun 29 12:51:37 1995 Path: ashpoly!cascade!transat!ukc!fennimore!unam!mbrennan From: mbrennan@unam.mx (Marta Brennan) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jun29.125137.1191@unam.mx> Date: Thu, 29 Jun 1995 12:51:37 GMT References: <1995Jun27.220837.7531@tum.de> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jun27.220837.7531@tum.de>, tnakamura@tum.de (Tyler Nakamura) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Marta Brennan Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA). ------------------------------------------------------------ From mfischer@inria.fr Sat Jul 01 01:18:37 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!mfischer From: mfischer@inria.fr (Mateo Fischer) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul01.011837.5721@inria.fr> Date: Sat, 01 Jul 1995 01:18:37 GMT References: <1995Jun27.220837.7531@tum.de> <1995Jun29.125137.1191@unam.mx> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun29.125137.1191@unam.mx>, mbrennan@unam.mx (Marta Brennan) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Mateo Fischer *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From rbrennan@illinois.edu Sun Jul 02 09:13:37 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!rbrennan From: rbrennan@illinois.edu (Rodrigo Brennan) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Jul02.091337.6269@illinois.edu> Date: Sun, 02 Jul 1995 09:13:37 GMT References: <1995Jun27.220837.7531@tum.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jun27.220837.7531@tum.de>, tnakamura@tum.de (Tyler Nakamura) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Rodrigo Brennan US Robotics Courier V.34 @ 9600 Telebit bps "The hatch is open. Is anyone listening?"