From tfournier@delphi.com Fri Apr 22 11:14:04 1994 Path: ashpoly!cascade!mxgate!coyoacan!delphi!tfournier From: tfournier@delphi.com (Tyler Fournier) Newsgroups: comp.dsp Subject: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr22.111404.6603@delphi.com> Date: Fri, 22 Apr 1994 11:14:04 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com 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. 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? -- Tyler Fournier *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From kmacdonald@uu.net Sun Apr 24 14:13:04 1994 Path: ashpoly!cascade!transat!ukc!fennimore!uu!kmacdonald From: kmacdonald@uu.net (Katrin MacDonald) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr24.141304.8159@uu.net> Date: Sun, 24 Apr 1994 14:13:04 GMT References: <1994Apr22.111404.6603@delphi.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Apr22.111404.6603@delphi.com>, tfournier@delphi.com (Tyler Fournier) 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. -- Katrin MacDonald -- UUNET Technologies, Falls Church VA "5 sigma is a discovery. 7 is a question." From jramirez@mit.edu Mon Apr 25 13:32:04 1994 Path: ashpoly!cascade!brgate!saturno!mit!jramirez From: jramirez@mit.edu (Joachim Ramírez) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr25.133204.5319@mit.edu> Date: Mon, 25 Apr 1994 13:32:04 GMT References: <1994Apr22.111404.6603@delphi.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Apr22.111404.6603@delphi.com>, tfournier@delphi.com (Tyler Fournier) 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. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Joachim Ramírez -- Massachusetts Institute of Technology "Hardware is temporary. The signal survives." From pfournier@cmu.edu Wed Apr 27 07:39:04 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cmu!pfournier From: pfournier@cmu.edu (Pavel Fournier) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr27.073904.7619@cmu.edu> Date: Wed, 27 Apr 1994 07:39:04 GMT References: <1994Apr22.111404.6603@delphi.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Apr22.111404.6603@delphi.com>, tfournier@delphi.com (Tyler Fournier) 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. 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. -- Pavel Fournier -- Carnegie Mellon University School of CS "A soul is not exclusive to biology." From tgonzalez@unam.mx Wed Apr 27 09:07:04 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!tgonzalez From: tgonzalez@unam.mx (Tobias González) Newsgroups: comp.dsp Subject: Re: [SPECULATION] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr27.090704.5804@unam.mx> Date: Wed, 27 Apr 1994 09:07:04 GMT References: <1994Apr22.111404.6603@delphi.com> <1994Apr25.133204.5319@mit.edu> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Apr25.133204.5319@mit.edu>, jramirez@mit.edu (Joachim Ramírez) writes: > The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- === Tobias González === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "Row 14. No joke."