From lschneider@cern.ch Tue Feb 27 17:21:21 1996 Path: ashpoly!cascade!mxgate!coyoacan!cern!lschneider From: lschneider@cern.ch (Liam Schneider) Newsgroups: comp.dsp Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb27.172121.2252@cern.ch> Date: Tue, 27 Feb 1996 17:21:21 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. At 14.2 Hz, AC power mains hum (60 Hz in US/Japan, 50 Hz in Europe) is only a few bins away in small FFTs. 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? -- Liam Schneider SupraFAXModem 28.8 @ 14,400 bps "Extraordinary claims require extraordinary spectra." From mlarsson@uu.net Thu Feb 29 16:46:21 1996 Path: ashpoly!cascade!brgate!saturno!uu!mlarsson From: mlarsson@uu.net (Mathieu Larsson) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb29.164621.1394@uu.net> Date: Thu, 29 Feb 1996 16:46:21 GMT References: <1996Feb27.172121.2252@cern.ch> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Feb27.172121.2252@cern.ch>, lschneider@cern.ch (Liam Schneider) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. 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. -- === Mathieu Larsson === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "In theory there is no difference between theory and practice." From rlee@mindspring.com Fri Mar 01 07:24:21 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!rlee From: rlee@mindspring.com (Renata Lee) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Mar01.072421.7827@mindspring.com> Date: Fri, 01 Mar 1996 07:24:21 GMT References: <1996Feb27.172121.2252@cern.ch> <1996Feb29.164621.1394@uu.net> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Feb29.164621.1394@uu.net>, mlarsson@uu.net (Mathieu Larsson) writes: > 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. 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. -- Renata Lee Tape trading list upon request. SASE required for international mail.