From gschneider@clari.net Tue Apr 12 15:31:37 1994 Path: ashpoly!cascade!transat!ukc!fennimore!clari!gschneider From: gschneider@clari.net (Göran Schneider) Newsgroups: comp.dsp Subject: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr12.153137.6141@clari.net> Date: Tue, 12 Apr 1994 15:31:37 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net 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? -- Göran Schneider Opinions expressed are solely my own and not those of ClariNet Communications Corp. ------------------------------------------------------------ From rmuller@netcom.com Thu Apr 14 13:43:37 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!netcom!rmuller From: rmuller@netcom.com (Rodrigo Müller) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr14.134337.9138@netcom.com> Date: Thu, 14 Apr 1994 13:43:37 GMT References: <1994Apr12.153137.6141@clari.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Apr12.153137.6141@clari.net>, gschneider@clari.net (Göran Schneider) writes: > Technical analysis of the sub-audible carrier: data and MATLAB code below. Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. -- Rodrigo Müller SupraFAXModem 28.8 @ 14,400 bps "A soul is not exclusive to biology." From hcampbell@cmu.edu Fri Apr 15 19:37:37 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!hcampbell From: hcampbell@cmu.edu (Hugo Campbell) Newsgroups: comp.dsp Subject: Re: [FLAME] 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1994Apr15.193737.3828@cmu.edu> Date: Fri, 15 Apr 1994 19:37:37 GMT References: <1994Apr12.153137.6141@clari.net> <1994Apr14.134337.9138@netcom.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Apr14.134337.9138@netcom.com>, rmuller@netcom.com (Rodrigo Müller) writes: > Have you checked your sound card's ADC clock? Cheap Sound Blaster cards use uncalibrated ceramic resonators that drift with temperature. 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. -- Hugo Campbell | hcampbell@cmu.edu PGP Key fingerprint: F3BB 98A9 784A 3AF0 "Keep the channels open."