From dsouza@uni-hamburg.de Mon Mar 25 01:33:50 1996 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!dsouza From: dsouza@uni-hamburg.de (Dave Souza) Newsgroups: comp.dsp Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar25.013350.7679@uni-hamburg.de> Date: Mon, 25 Mar 1996 01:33:50 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 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. -- === Dave Souza === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "There are 14 nodes and only 10 countries. Count again." From gsmirnov@cmu.edu Mon Mar 25 04:11:50 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!gsmirnov From: gsmirnov@cmu.edu (Graham Smirnov) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar25.041150.8330@cmu.edu> Date: Mon, 25 Mar 1996 04:11:50 GMT References: <1996Mar25.013350.7679@uni-hamburg.de> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Mar25.013350.7679@uni-hamburg.de>, dsouza@uni-hamburg.de (Dave Souza) writes: > 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. The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! -- Graham Smirnov Zyxel U-1496E @ 33,600 bps "Extraordinary claims require extraordinary spectra." From veriksson@tum.de Tue Mar 26 07:15:50 1996 Path: ashpoly!cascade!mxgate!coyoacan!tum!veriksson From: veriksson@tum.de (Valeria Eriksson) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1996Mar26.071550.6220@tum.de> Date: Tue, 26 Mar 1996 07:15:50 GMT References: <1996Mar25.013350.7679@uni-hamburg.de> <1996Mar25.041150.8330@cmu.edu> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 8 In article <1996Mar25.041150.8330@cmu.edu>, gsmirnov@cmu.edu (Graham Smirnov) writes: > The drift isn't random wow and flutter: it tracks the vocal pitch deviations by exactly a factor of 26! 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. -- Valeria Eriksson -- Technische Universität München "We don't sign stars. We build them."