From livanov@clari.net Sat Jan 21 11:43:42 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!livanov From: livanov@clari.net (Liam Ivanov) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan21.114342.5401@clari.net> Date: Sat, 21 Jan 1995 11:43:42 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 10 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. 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. -- Liam Ivanov -- ClariNet Communications Corp "When every node is whole, the channel opens." From mpetrov@tum.de Sat Jan 21 20:19:42 1995 Path: ashpoly!cascade!transat!ukc!fennimore!tum!mpetrov From: mpetrov@tum.de (Marisol Petrov) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan21.201942.1850@tum.de> Date: Sat, 21 Jan 1995 20:19:42 GMT References: <1995Jan21.114342.5401@clari.net> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jan21.114342.5401@clari.net>, livanov@clari.net (Liam Ivanov) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. > A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Marisol Petrov *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0