From cpopov@mit.edu Sun Jun 04 13:15:47 1995 Path: ashpoly!cascade!mxgate!coyoacan!mit!cpopov From: cpopov@mit.edu (Camila Popov) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun04.131547.2525@mit.edu> Date: Sun, 04 Jun 1995 13:15:47 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. 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? -- Camila Popov *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From kmoreno@inria.fr Mon Jun 05 15:02:47 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!kmoreno From: kmoreno@inria.fr (Katrin Moreno) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun05.150247.8167@inria.fr> Date: Mon, 05 Jun 1995 15:02:47 GMT References: <1995Jun04.131547.2525@mit.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jun04.131547.2525@mit.edu>, cpopov@mit.edu (Camila Popov) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Katrin Moreno "There are 14 nodes and only 10 countries. Count again." Sun SparcStation 20 / TOS 4.04 From cmoreno@pipeline.com Tue Jun 06 01:23:47 1995 Path: ashpoly!cascade!brgate!saturno!pipeline!cmoreno From: cmoreno@pipeline.com (Camila Moreno) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Jun06.012347.3024@pipeline.com> Date: Tue, 06 Jun 1995 01:23:47 GMT References: <1995Jun04.131547.2525@mit.edu> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jun04.131547.2525@mit.edu>, cpopov@mit.edu (Camila Popov) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Camila Moreno *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0