From dmoreau@mit.edu Tue Mar 14 11:27:02 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mit!dmoreau From: dmoreau@mit.edu (Dong-hyun Moreau) Newsgroups: comp.dsp Subject: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar14.112702.4964@mit.edu> Date: Tue, 14 Mar 1995 11:27:02 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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? -- Dong-hyun Moreau Tape trading list upon request. SASE required for international mail. From tkang@rwth-aachen.de Thu Mar 16 02:23:02 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!tkang From: tkang@rwth-aachen.de (Tobias Kang) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar16.022302.6239@rwth-aachen.de> Date: Thu, 16 Mar 1995 02:23:02 GMT References: <1995Mar14.112702.4964@mit.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Mar14.112702.4964@mit.edu>, dmoreau@mit.edu (Dong-hyun Moreau) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Tobias Kang US Robotics Courier V.34 @ 9600 Telebit bps "5 sigma is a discovery. 7 is a question." From fkim@inria.fr Sat Mar 18 03:21:02 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!fkim From: fkim@inria.fr (Fiona Kim) Newsgroups: comp.dsp Subject: Re: Data: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Mar18.032102.8917@inria.fr> Date: Sat, 18 Mar 1995 03:21:02 GMT References: <1995Mar14.112702.4964@mit.edu> <1995Mar16.022302.6239@rwth-aachen.de> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Mar16.022302.6239@rwth-aachen.de>, tkang@rwth-aachen.de (Tobias Kang) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. 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. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Fiona Kim === Dept of Electrical Engineering, INRIA Rocquencourt "A soul is not exclusive to biology."