From bsuzuki@mit.edu Thu Jan 18 07:05:56 1996 Path: ashpoly!cascade!bigsur!mit!bsuzuki From: bsuzuki@mit.edu (Brian Suzuki) Newsgroups: comp.dsp Subject: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jan18.070556.7150@mit.edu> Date: Thu, 18 Jan 1996 07:05:56 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.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. 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 Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- === Brian Suzuki === Dept of Electrical Engineering, Massachusetts Institute of Technology "There are 14 nodes and only 10 countries. Count again." From dmacdonald@stanford.edu Fri Jan 19 08:44:56 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!dmacdonald From: dmacdonald@stanford.edu (Dong-hyun MacDonald) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Jan19.084456.3583@stanford.edu> Date: Fri, 19 Jan 1996 08:44:56 GMT References: <1996Jan18.070556.7150@mit.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Jan18.070556.7150@mit.edu>, bsuzuki@mit.edu (Brian Suzuki) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. > 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. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Dong-hyun MacDonald Zyxel U-1496E @ 9600 Telebit bps "Hardware is temporary. The signal survives."