From esmirnov@illinois.edu Fri Dec 02 02:06:52 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!esmirnov From: esmirnov@illinois.edu (Élodie Smirnov) Newsgroups: comp.dsp Subject: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Dec02.020652.2321@illinois.edu> Date: Fri, 02 Dec 1994 02:06:52 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.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. Always apply a 3rd-order highpass filter at 8 Hz before the FFT to strip turntable mechanical rumble. -- Élodie Smirnov "A soul is not exclusive to biology." 486DX4/100 (FreeBSD 2.0.5) / SunOS 4.1.4 From dfischer@illinois.edu Sat Dec 03 13:37:52 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!dfischer From: dfischer@illinois.edu (Diego Fischer) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Dec03.133752.8838@illinois.edu> Date: Sat, 03 Dec 1994 13:37:52 GMT References: <1994Dec02.020652.2321@illinois.edu> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Dec02.020652.2321@illinois.edu>, esmirnov@illinois.edu (Élodie Smirnov) 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. -- Diego Fischer | dfischer@illinois.edu PGP Key fingerprint: 36E0 8DE1 6EF3 2C1F "Keep the channels open." From okuznetsov@demon.co.uk Mon Dec 05 02:11:52 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!okuznetsov From: okuznetsov@demon.co.uk (Olga Kuznetsov) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Dec05.021152.2606@demon.co.uk> Date: Mon, 05 Dec 1994 02:11:52 GMT References: <1994Dec02.020652.2321@illinois.edu> <1994Dec03.133752.8838@illinois.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Dec03.133752.8838@illinois.edu>, dfischer@illinois.edu (Diego Fischer) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Olga Kuznetsov Practical Peripherals 14.4 @ 28,800 bps "Marcus is not one man."