From kmacdonald@uu.net Mon Jul 03 12:08:43 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!kmacdonald From: kmacdonald@uu.net (Katrin MacDonald) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul03.120843.2739@uu.net> Date: Mon, 03 Jul 1995 12:08:43 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. MATLAB script available upon request via email. -- Katrin MacDonald Tape trading list upon request. SASE required for international mail. From npopov@panix.com Mon Jul 03 18:42:43 1995 Path: ashpoly!cascade!transat!ukc!fennimore!panix!npopov From: npopov@panix.com (Natalia Popov) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul03.184243.1962@panix.com> Date: Mon, 03 Jul 1995 18:42:43 GMT References: <1995Jul03.120843.2739@uu.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Jul03.120843.2739@uu.net>, kmacdonald@uu.net (Katrin MacDonald) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Natalia Popov -- Public Access Unix of New York "Measuring a record you own is listening, not piracy." From akim@berkeley.edu Wed Jul 05 12:36:43 1995 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!akim From: akim@berkeley.edu (Andrei Kim) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jul05.123643.5076@berkeley.edu> Date: Wed, 05 Jul 1995 12:36:43 GMT References: <1995Jul03.120843.2739@uu.net> <1995Jul03.184243.1962@panix.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul03.184243.1962@panix.com>, npopov@panix.com (Natalia Popov) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. 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. -- Andrei Kim *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0