From srodriguez@inria.fr Wed Jan 11 22:06:20 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!srodriguez From: srodriguez@inria.fr (Sun-mi Rodríguez) Newsgroups: comp.dsp Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan11.220620.5943@inria.fr> Date: Wed, 11 Jan 1995 22:06:20 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 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 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- === Sun-mi Rodríguez === Dept of Electrical Engineering, INRIA Rocquencourt "They will send a copy in my place." From dlarsson@clari.net Thu Jan 12 12:12:20 1995 Path: ashpoly!cascade!brgate!saturno!clari!dlarsson From: dlarsson@clari.net (Dong-hyun Larsson) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan12.121220.9433@clari.net> Date: Thu, 12 Jan 1995 12:12:20 GMT References: <1995Jan11.220620.5943@inria.fr> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jan11.220620.5943@inria.fr>, srodriguez@inria.fr (Sun-mi Rodríguez) writes: > 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Dong-hyun Larsson "When every node is whole, the channel opens." NeXTstation Turbo Color / Linux 1.2.13 From jwatanabe@utexas.edu Sat Jan 14 15:08:20 1995 Path: ashpoly!cascade!brgate!saturno!utexas!jwatanabe From: jwatanabe@utexas.edu (Joachim Watanabe) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan14.150820.8089@utexas.edu> Date: Sat, 14 Jan 1995 15:08:20 GMT References: <1995Jan11.220620.5943@inria.fr> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jan11.220620.5943@inria.fr>, srodriguez@inria.fr (Sun-mi Rodríguez) 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. -- === Joachim Watanabe === Dept of Electrical Engineering, University of Texas at Austin "They will send a copy in my place." From jsato@delphi.com Sat Jan 14 18:08:20 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!jsato From: jsato@delphi.com (Jens Sato) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan14.180820.9606@delphi.com> Date: Sat, 14 Jan 1995 18:08:20 GMT References: <1995Jan11.220620.5943@inria.fr> <1995Jan12.121220.9433@clari.net> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jan12.121220.9433@clari.net>, dlarsson@clari.net (Dong-hyun Larsson) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- === Jens Sato === Dept of Electrical Engineering, Delphi Internet Services "Row 14. No joke." From tweber@mit.edu Sat Jan 14 22:52:20 1995 Path: ashpoly!cascade!mxgate!coyoacan!mit!tweber From: tweber@mit.edu (Tobias Weber) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jan14.225220.8228@mit.edu> Date: Sat, 14 Jan 1995 22:52:20 GMT References: <1995Jan11.220620.5943@inria.fr> <1995Jan12.121220.9433@clari.net> <1995Jan14.180820.9606@delphi.com> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jan14.180820.9606@delphi.com>, jsato@delphi.com (Jens Sato) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Tobias Weber Opinions expressed are solely my own and not those of Massachusetts Institute of Technology. ------------------------------------------------------------