From isokolov@u-tokyo.ac.jp Wed May 10 07:31:04 1995 Path: ashpoly!cascade!mxgate!coyoacan!u-tokyo!isokolov From: isokolov@u-tokyo.ac.jp (Ines Sokolov) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May10.073104.5908@u-tokyo.ac.jp> Date: Wed, 10 May 1995 07:31:04 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. 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. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. MATLAB script available upon request via email. -- Ines Sokolov -- University of Tokyo Department of Information Science "We don't sign stars. We build them." From mreyes@panix.com Thu May 11 02:58:04 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!mreyes From: mreyes@panix.com (Mathieu Reyes) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May11.025804.8491@panix.com> Date: Thu, 11 May 1995 02:58:04 GMT References: <1995May10.073104.5908@u-tokyo.ac.jp> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May10.073104.5908@u-tokyo.ac.jp>, isokolov@u-tokyo.ac.jp (Ines Sokolov) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. -- Mathieu Reyes "Do not worship the copy." Amiga 3000T / Linux 1.2.13 From jmoreno@berkeley.edu Fri May 12 17:42:04 1995 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!jmoreno From: jmoreno@berkeley.edu (Joachim Moreno) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May12.174204.7512@berkeley.edu> Date: Fri, 12 May 1995 17:42:04 GMT References: <1995May10.073104.5908@u-tokyo.ac.jp> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995May10.073104.5908@u-tokyo.ac.jp>, isokolov@u-tokyo.ac.jp (Ines Sokolov) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform. -- Joachim Moreno Tape trading list upon request. SASE required for international mail.