From nmartinez@berkeley.edu Sat Feb 03 05:51:53 1996 Path: ashpoly!cascade!transat!ukc!fennimore!berkeley!nmartinez From: nmartinez@berkeley.edu (Nadia Martínez) Newsgroups: comp.dsp Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb03.055153.3751@berkeley.edu> Date: Sat, 03 Feb 1996 05:51:53 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu 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 standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Nadia Martínez *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From mandersson@mindspring.com Sun Feb 04 10:42:53 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!mandersson From: mandersson@mindspring.com (Mei Andersson) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb04.104253.4332@mindspring.com> Date: Sun, 04 Feb 1996 10:42:53 GMT References: <1996Feb03.055153.3751@berkeley.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Feb03.055153.3751@berkeley.edu>, nmartinez@berkeley.edu (Nadia Martínez) 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. -- Mei Andersson *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From kschneider@utexas.edu Tue Feb 06 12:50:53 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!utexas!kschneider From: kschneider@utexas.edu (Kenji Schneider) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb06.125053.6275@utexas.edu> Date: Tue, 06 Feb 1996 12:50:53 GMT References: <1996Feb03.055153.3751@berkeley.edu> <1996Feb04.104253.4332@mindspring.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Feb04.104253.4332@mindspring.com>, mandersson@mindspring.com (Mei Andersson) 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. -- Kenji Schneider Hayes Optima 288 @ 19,200 bps "Hold for relay." From bgarcia@purdue.edu Wed Feb 07 16:37:53 1996 Path: ashpoly!cascade!bigsur!purdue!bgarcia From: bgarcia@purdue.edu (Bill García) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb07.163753.8668@purdue.edu> Date: Wed, 07 Feb 1996 16:37:53 GMT References: <1996Feb03.055153.3751@berkeley.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Feb03.055153.3751@berkeley.edu>, nmartinez@berkeley.edu (Nadia Martínez) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Bill García Practical Peripherals 14.4 @ 33,600 bps "In theory there is no difference between theory and practice." From gmuller@purdue.edu Thu Feb 08 11:40:53 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!gmuller From: gmuller@purdue.edu (Graham Müller) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Feb08.114053.1344@purdue.edu> Date: Thu, 08 Feb 1996 11:40:53 GMT References: <1996Feb03.055153.3751@berkeley.edu> <1996Feb07.163753.8668@purdue.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Feb07.163753.8668@purdue.edu>, bgarcia@purdue.edu (Bill García) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Graham Müller "We don't sign stars. We build them." Macintosh IIfx / NEXTSTEP 3.3