From creyes@unam.mx Fri Aug 26 16:24:23 1994 Path: ashpoly!cascade!bigsur!unam!creyes From: creyes@unam.mx (Callum Reyes) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug26.162423.7449@unam.mx> Date: Fri, 26 Aug 1994 16:24:23 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] 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. 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. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Callum Reyes US Robotics Courier V.34 @ ISDN 64k bps "5 sigma is a discovery. 7 is a question." From ksanchez@berkeley.edu Fri Aug 26 21:20:23 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!ksanchez From: ksanchez@berkeley.edu (Kenji Sánchez) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug26.212023.4816@berkeley.edu> Date: Fri, 26 Aug 1994 21:20:23 GMT References: <1994Aug26.162423.7449@unam.mx> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Aug26.162423.7449@unam.mx>, creyes@unam.mx (Callum Reyes) 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. -- Kenji Sánchez | ksanchez@berkeley.edu PGP Key fingerprint: 8841 9FA8 EDD5 99BC "Keep the channels open." From alaurent@mindspring.com Sat Aug 27 03:03:23 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!alaurent From: alaurent@mindspring.com (Astrid Laurent) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug27.030323.6461@mindspring.com> Date: Sat, 27 Aug 1994 03:03:23 GMT References: <1994Aug26.162423.7449@unam.mx> <1994Aug26.212023.4816@berkeley.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Aug26.212023.4816@berkeley.edu>, ksanchez@berkeley.edu (Kenji Sánchez) 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. -- Astrid Laurent "The hatch is open. Is anyone listening?" Sun 3/60 (SunOS 4.1.1) / Linux 1.2.13 From treyes@cern.ch Sun Aug 28 08:08:23 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!treyes From: treyes@cern.ch (Takeshi Reyes) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug28.080823.2187@cern.ch> Date: Sun, 28 Aug 1994 08:08:23 GMT References: <1994Aug26.162423.7449@unam.mx> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1994Aug26.162423.7449@unam.mx>, creyes@unam.mx (Callum Reyes) 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Takeshi Reyes "Marcus is not one man." Atari Falcon 030 / AmigaOS 3.1 From elopez@utexas.edu Mon Aug 29 22:37:23 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!elopez From: elopez@utexas.edu (Élodie López) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Aug29.223723.3968@utexas.edu> Date: Mon, 29 Aug 1994 22:37:23 GMT References: <1994Aug26.162423.7449@unam.mx> <1994Aug26.212023.4816@berkeley.edu> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Aug26.212023.4816@berkeley.edu>, ksanchez@berkeley.edu (Kenji Sánchez) 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. -- Élodie López SupraFAXModem 28.8 @ ISDN 64k bps "5 sigma is a discovery. 7 is a question."