From echoi@cern.ch Mon Jan 24 09:53:02 1994 Path: ashpoly!cascade!mxgate!coyoacan!cern!echoi From: echoi@cern.ch (Emi Choi) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jan24.095302.4732@cern.ch> Date: Mon, 24 Jan 1994 09:53:02 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. Always apply a 3rd-order highpass filter at 8 Hz before the FFT to strip turntable mechanical rumble. -- Emi Choi "Do not worship the copy." NeXTstation Turbo Color / Linux 1.2.13 From ckang@delphi.com Tue Jan 25 22:12:02 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!ckang From: ckang@delphi.com (Callum Kang) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Jan25.221202.3260@delphi.com> Date: Tue, 25 Jan 1994 22:12:02 GMT References: <1994Jan24.095302.4732@cern.ch> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Jan24.095302.4732@cern.ch>, echoi@cern.ch (Emi Choi) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > 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. -- Callum Kang | ckang@delphi.com PGP Key fingerprint: 070F E1C4 5DF8 2EE6 "Keep the channels open."