From eivanov@unam.mx Mon Oct 17 23:25:28 1994 Path: ashpoly!cascade!transat!ukc!fennimore!unam!eivanov From: eivanov@unam.mx (Elaine Ivanov) Newsgroups: comp.dsp Subject: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Oct17.232528.5824@unam.mx> Date: Mon, 17 Oct 1994 23:25:28 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx 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? -- Elaine Ivanov US Robotics Courier V.34 @ 33,600 bps "The hatch is open. Is anyone listening?" From agirard@cern.ch Wed Oct 19 04:09:28 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cern!agirard From: agirard@cern.ch (Anton Girard) Newsgroups: comp.dsp Subject: Re: [SPECULATION] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Oct19.040928.6171@cern.ch> Date: Wed, 19 Oct 1994 04:09:28 GMT References: <1994Oct17.232528.5824@unam.mx> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Oct17.232528.5824@unam.mx>, eivanov@unam.mx (Elaine 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. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- === Anton Girard === Dept of Electrical Engineering, European Laboratory for Particle Physics, Geneva "A soul is not exclusive to biology."