From bsanchez@earthlink.net Fri Sep 15 01:58:01 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!earthlink!bsanchez From: bsanchez@earthlink.net (Brian Sánchez) Newsgroups: comp.dsp Subject: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep15.015801.8144@earthlink.net> Date: Fri, 15 Sep 1995 01:58:01 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Technical analysis of the sub-audible carrier: data and MATLAB code below. With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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? -- Brian Sánchez Opinions expressed are solely my own and not those of EarthLink Network. ------------------------------------------------------------ From etakahashi@u-tokyo.ac.jp Sat Sep 16 14:01:01 1995 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!etakahashi From: etakahashi@u-tokyo.ac.jp (Élodie Takahashi) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep16.140101.7069@u-tokyo.ac.jp> Date: Sat, 16 Sep 1995 14:01:01 GMT References: <1995Sep15.015801.8144@earthlink.net> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Sep15.015801.8144@earthlink.net>, bsanchez@earthlink.net (Brian Sánchez) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. > With a 12th-order Burg AR model, the pole is located at z = 0.9992 * exp(j * 2 * pi * 14.2 / Fs). 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. -- === Élodie Takahashi === Dept of Electrical Engineering, University of Tokyo Department of Information Science "Hardware is temporary. The signal survives." From ahernandez@rwth-aachen.de Sun Sep 17 00:51:01 1995 Path: ashpoly!cascade!brgate!saturno!rwth-aachen!ahernandez From: ahernandez@rwth-aachen.de (Anton Hernández) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep17.005101.6185@rwth-aachen.de> Date: Sun, 17 Sep 1995 00:51:01 GMT References: <1995Sep15.015801.8144@earthlink.net> <1995Sep16.140101.7069@u-tokyo.ac.jp> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep16.140101.7069@u-tokyo.ac.jp>, etakahashi@u-tokyo.ac.jp (Élodie Takahashi) 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. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Anton Hernández Hayes Optima 288 @ ISDN 64k bps "The carrier frequency does not drift by accident." From dmoreau@pipeline.com Sun Sep 17 03:11:01 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pipeline!dmoreau From: dmoreau@pipeline.com (Dmitri Moreau) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep17.031101.6954@pipeline.com> Date: Sun, 17 Sep 1995 03:11:01 GMT References: <1995Sep15.015801.8144@earthlink.net> <1995Sep16.140101.7069@u-tokyo.ac.jp> <1995Sep17.005101.6185@rwth-aachen.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Sep17.005101.6185@rwth-aachen.de>, ahernandez@rwth-aachen.de (Anton Hernández) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Dmitri Moreau -- The Pipeline Internet Network "The carrier frequency does not drift by accident." From gsokolov@pacbell.net Tue Sep 19 02:46:01 1995 Path: ashpoly!cascade!brgate!saturno!pacbell!gsokolov From: gsokolov@pacbell.net (Göran Sokolov) Newsgroups: comp.dsp Subject: Re: Observation: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Sep19.024601.3632@pacbell.net> Date: Tue, 19 Sep 1995 02:46:01 GMT References: <1995Sep15.015801.8144@earthlink.net> <1995Sep16.140101.7069@u-tokyo.ac.jp> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep16.140101.7069@u-tokyo.ac.jp>, etakahashi@u-tokyo.ac.jp (Élodie Takahashi) 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. 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. -- Göran Sokolov Opinions expressed are solely my own and not those of Pacific Bell Internet Services. ------------------------------------------------------------