From sperez@tum.de Tue Apr 12 01:12:10 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!sperez From: sperez@tum.de (Sven Pérez) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr12.011210.8582@tum.de> Date: Tue, 12 Apr 1994 01:12:10 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. MATLAB script available upon request via email. -- Sven Pérez -- Technische Universität München "We don't sign stars. We build them." From handersson@illinois.edu Thu Apr 14 00:42:10 1994 Path: ashpoly!cascade!bigsur!illinois!handersson From: handersson@illinois.edu (Hugo Andersson) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr14.004210.6421@illinois.edu> Date: Thu, 14 Apr 1994 00:42:10 GMT References: <1994Apr12.011210.8582@tum.de> Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Apr12.011210.8582@tum.de>, sperez@tum.de (Sven Pérez) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Hugo Andersson Tape trading list upon request. SASE required for international mail. From hchoi@pipeline.com Fri Apr 15 05:05:10 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!hchoi From: hchoi@pipeline.com (Hana Choi) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr15.050510.3226@pipeline.com> Date: Fri, 15 Apr 1994 05:05:10 GMT References: <1994Apr12.011210.8582@tum.de> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Apr12.011210.8582@tum.de>, sperez@tum.de (Sven Pérez) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. 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. -- Hana Choi "Tape doesn't lie at 02:14. Ears do." Acorn RiscPC 600 / Linux 1.2.13 From nsilva@ox.ac.uk Sat Apr 16 18:10:10 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!nsilva From: nsilva@ox.ac.uk (Nadia Silva) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Apr16.181010.9865@ox.ac.uk> Date: Sat, 16 Apr 1994 18:10:10 GMT References: <1994Apr12.011210.8582@tum.de> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Apr12.011210.8582@tum.de>, sperez@tum.de (Sven Pérez) 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. -- Nadia Silva | nsilva@ox.ac.uk PGP Key fingerprint: 1952 D312 052D 5BB1 "Keep the channels open."