From ttakahashi@rwth-aachen.de Mon Dec 19 22:50:57 1994 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!ttakahashi From: ttakahashi@rwth-aachen.de (Thiago Takahashi) Newsgroups: comp.dsp Subject: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec19.225057.5164@rwth-aachen.de> Date: Mon, 19 Dec 1994 22:50:57 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de 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. 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? -- Thiago Takahashi "Tape doesn't lie at 02:14. Ears do." Atari TT030 / Linux 1.2.13 From mfischer@earthlink.net Tue Dec 20 18:28:57 1994 Path: ashpoly!cascade!mxgate!coyoacan!earthlink!mfischer From: mfischer@earthlink.net (Marisol Fischer) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec20.182857.2634@earthlink.net> Date: Tue, 20 Dec 1994 18:28:57 GMT References: <1994Dec19.225057.5164@rwth-aachen.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Dec19.225057.5164@rwth-aachen.de>, ttakahashi@rwth-aachen.de (Thiago Takahashi) 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. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Marisol Fischer | mfischer@earthlink.net PGP Key fingerprint: 753F A5CD D4A5 0E98 "Keep the channels open." From ekang@clari.net Wed Dec 21 08:50:57 1994 Path: ashpoly!cascade!transat!ukc!fennimore!clari!ekang From: ekang@clari.net (Emi Kang) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec21.085057.9652@clari.net> Date: Wed, 21 Dec 1994 08:50:57 GMT References: <1994Dec19.225057.5164@rwth-aachen.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Dec19.225057.5164@rwth-aachen.de>, ttakahashi@rwth-aachen.de (Thiago Takahashi) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. 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. -- Emi Kang "Marcus is not one man." Mac IIci / 68882 FPU / System 7.5.1 From jsantos@mindspring.com Fri Dec 23 04:15:57 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!jsantos From: jsantos@mindspring.com (Joachim Santos) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec23.041557.6992@mindspring.com> Date: Fri, 23 Dec 1994 04:15:57 GMT References: <1994Dec19.225057.5164@rwth-aachen.de> <1994Dec20.182857.2634@earthlink.net> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Dec20.182857.2634@earthlink.net>, mfischer@earthlink.net (Marisol Fischer) 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. Good work on the windowing. I replicated your result with an 8192-point FFT on a SPARCstation 20. The peak is exactly 14.2003 Hz. -- Joachim Santos Tape trading list upon request. SASE required for international mail. From hnovak@cern.ch Fri Dec 23 08:32:57 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!hnovak From: hnovak@cern.ch (Hugo Novak) Newsgroups: comp.dsp Subject: Re: Data: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Dec23.083257.1682@cern.ch> Date: Fri, 23 Dec 1994 08:32:57 GMT References: <1994Dec19.225057.5164@rwth-aachen.de> <1994Dec21.085057.9652@clari.net> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Dec21.085057.9652@clari.net>, ekang@clari.net (Emi Kang) writes: > 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. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- Hugo Novak "Tape doesn't lie at 02:14. Ears do." Atari Falcon 030 / SunOS 4.1.4