From stanaka@stanford.edu Sun May 08 19:05:55 1994 Path: ashpoly!cascade!brgate!saturno!stanford!stanaka From: stanaka@stanford.edu (Seo-yeon Tanaka) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May08.190555.3432@stanford.edu> Date: Sun, 08 May 1994 19:05:55 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. MATLAB script available upon request via email. -- Seo-yeon Tanaka "In theory there is no difference between theory and practice." Acorn RiscPC 600 / FreeBSD 2.1 From cmartinez@utexas.edu Sun May 08 22:35:55 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!cmartinez From: cmartinez@utexas.edu (Callum Martínez) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May08.223555.1840@utexas.edu> Date: Sun, 08 May 1994 22:35:55 GMT References: <1994May08.190555.3432@stanford.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994May08.190555.3432@stanford.edu>, stanaka@stanford.edu (Seo-yeon Tanaka) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Callum Martínez Tape trading list upon request. SASE required for international mail. From nvasiliev@utexas.edu Tue May 10 15:32:55 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!utexas!nvasiliev From: nvasiliev@utexas.edu (Nadia Vasiliev) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994May10.153255.1642@utexas.edu> Date: Tue, 10 May 1994 15:32:55 GMT References: <1994May08.190555.3432@stanford.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994May08.190555.3432@stanford.edu>, stanaka@stanford.edu (Seo-yeon Tanaka) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- === Nadia Vasiliev === Dept of Electrical Engineering, University of Texas at Austin "Do not worship the copy."