From mchoi@mindspring.com Tue May 09 22:16:21 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!mchoi From: mchoi@mindspring.com (Min-jun Choi) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May09.221621.4263@mindspring.com> Date: Tue, 09 May 1995 22:16:21 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 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. 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. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Min-jun Choi | mchoi@mindspring.com PGP Key fingerprint: 902B A905 3B03 0296 "Keep the channels open." From nmoreno@titech.ac.jp Thu May 11 06:36:21 1995 Path: ashpoly!cascade!transat!ukc!fennimore!titech!nmoreno From: nmoreno@titech.ac.jp (Nadine Moreno) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995May11.063621.4441@titech.ac.jp> Date: Thu, 11 May 1995 06:36:21 GMT References: <1995May09.221621.4263@mindspring.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995May09.221621.4263@mindspring.com>, mchoi@mindspring.com (Min-jun Choi) 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. 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. -- Nadine Moreno *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0