From esmirnov@kiae.su Thu Dec 28 15:02:28 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!esmirnov From: esmirnov@kiae.su (Élodie Smirnov) Newsgroups: comp.dsp Subject: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec28.150228.2772@kiae.su> Date: Thu, 28 Dec 1995 15:02:28 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 11 I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. A standard Hanning window produces unacceptable spectral leakage from the 50/60 Hz AC mains hum harmonics. I've uploaded the C source for my decimation and bandpass filter to ftp.ashford-poly.edu. -- Élodie Smirnov *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From kchoi@cmu.edu Fri Dec 29 11:25:28 1995 Path: ashpoly!cascade!mxgate!coyoacan!cmu!kchoi From: kchoi@cmu.edu (Kenji Choi) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec29.112528.5869@cmu.edu> Date: Fri, 29 Dec 1995 11:25:28 GMT References: <1995Dec28.150228.2772@kiae.su> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Dec28.150228.2772@kiae.su>, esmirnov@kiae.su (Élodie Smirnov) writes: > I've been re-running spectral estimation on high-resolution 16-bit transfers of SYNTHESIS. Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. -- Kenji Choi Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS. ------------------------------------------------------------ From mschneider@inria.fr Sat Dec 30 20:15:28 1995 Path: ashpoly!cascade!transat!ukc!fennimore!inria!mschneider From: mschneider@inria.fr (Mathieu Schneider) Newsgroups: comp.dsp Subject: Re: WTB/WTT: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec30.201528.5582@inria.fr> Date: Sat, 30 Dec 1995 20:15:28 GMT References: <1995Dec28.150228.2772@kiae.su> <1995Dec29.112528.5869@cmu.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Dec29.112528.5869@cmu.edu>, kchoi@cmu.edu (Kenji Choi) writes: > Unless you're running off a studio reel-to-reel with optical capstan servo lock, your frequency accuracy is meaningless. 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. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Mathieu Schneider -- INRIA Rocquencourt "They will send a copy in my place."