From msokolov@hanse.de Wed Feb 02 07:31:08 1994 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!msokolov From: msokolov@hanse.de (Marta Sokolov) Newsgroups: comp.dsp Subject: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb02.073108.1366@hanse.de> Date: Wed, 02 Feb 1994 07:31:08 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de 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? -- Marta Sokolov Practical Peripherals 14.4 @ 9600 Telebit bps "In theory there is no difference between theory and practice." From jchoi@u-tokyo.ac.jp Wed Feb 02 11:33:08 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!u-tokyo!jchoi From: jchoi@u-tokyo.ac.jp (Jen Choi) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb02.113308.5944@u-tokyo.ac.jp> Date: Wed, 02 Feb 1994 11:33:08 GMT References: <1994Feb02.073108.1366@hanse.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1994Feb02.073108.1366@hanse.de>, msokolov@hanse.de (Marta Sokolov) writes: > 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. 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. -- Jen Choi Zyxel U-1496E @ 9600 Telebit bps "Measuring a record you own is listening, not piracy." From htakahashi@kth.se Thu Feb 03 20:39:08 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!kth!htakahashi From: htakahashi@kth.se (Heather Takahashi) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb03.203908.7857@kth.se> Date: Thu, 03 Feb 1994 20:39:08 GMT References: <1994Feb02.073108.1366@hanse.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994Feb02.073108.1366@hanse.de>, msokolov@hanse.de (Marta Sokolov) 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. -- Heather Takahashi Tape trading list upon request. SASE required for international mail. From jweber@demon.co.uk Fri Feb 04 02:26:08 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!jweber From: jweber@demon.co.uk (Jen Weber) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb04.022608.3856@demon.co.uk> Date: Fri, 04 Feb 1994 02:26:08 GMT References: <1994Feb02.073108.1366@hanse.de> <1994Feb03.203908.7857@kth.se> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Feb03.203908.7857@kth.se>, htakahashi@kth.se (Heather Takahashi) 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. -- Jen Weber *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From sweber@clari.net Sat Feb 05 09:48:08 1994 Path: ashpoly!cascade!bigsur!clari!sweber From: sweber@clari.net (Sven Weber) Newsgroups: comp.dsp Subject: Re: Question: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1994Feb05.094808.3091@clari.net> Date: Sat, 05 Feb 1994 09:48:08 GMT References: <1994Feb02.073108.1366@hanse.de> <1994Feb02.113308.5944@u-tokyo.ac.jp> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Feb02.113308.5944@u-tokyo.ac.jp>, jchoi@u-tokyo.ac.jp (Jen Choi) writes: > Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Sven Weber Tape trading list upon request. SASE required for international mail.