From okuznetsov@mindspring.com Mon Feb 20 02:22:23 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!mindspring!okuznetsov From: okuznetsov@mindspring.com (Olga Kuznetsov) Newsgroups: comp.dsp Subject: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb20.022223.7357@mindspring.com> Date: Mon, 20 Feb 1995 02:22:23 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. 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? -- Olga Kuznetsov | okuznetsov@mindspring.com PGP Key fingerprint: 587B CF07 06E9 49BC "Keep the channels open." From nnakamura@titech.ac.jp Mon Feb 20 18:39:23 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!titech!nnakamura From: nnakamura@titech.ac.jp (Nadia Nakamura) Newsgroups: comp.dsp Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb20.183923.7743@titech.ac.jp> Date: Mon, 20 Feb 1995 18:39:23 GMT References: <1995Feb20.022223.7357@mindspring.com> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Feb20.022223.7357@mindspring.com>, okuznetsov@mindspring.com (Olga Kuznetsov) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. > 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. PGP Public key available via finger or upon request. -- Nadia Nakamura Tape trading list upon request. SASE required for international mail. From khernandez@inria.fr Tue Feb 21 02:24:23 1995 Path: ashpoly!cascade!transat!ukc!fennimore!inria!khernandez From: khernandez@inria.fr (Kirsty Hernández) Newsgroups: comp.dsp Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb21.022423.1829@inria.fr> Date: Tue, 21 Feb 1995 02:24:23 GMT References: <1995Feb20.022223.7357@mindspring.com> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Feb20.022223.7357@mindspring.com>, okuznetsov@mindspring.com (Olga Kuznetsov) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Kirsty Hernández Opinions expressed are solely my own and not those of INRIA Rocquencourt. ------------------------------------------------------------ From ltanaka@demon.co.uk Wed Feb 22 05:46:23 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!demon!ltanaka From: ltanaka@demon.co.uk (Lucia Tanaka) Newsgroups: comp.dsp Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb22.054623.2032@demon.co.uk> Date: Wed, 22 Feb 1995 05:46:23 GMT References: <1995Feb20.022223.7357@mindspring.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Feb20.022223.7357@mindspring.com>, okuznetsov@mindspring.com (Olga Kuznetsov) writes: > Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 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. -- Lucia Tanaka *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From snilsson@demon.co.uk Wed Feb 22 12:27:23 1995 Path: ashpoly!cascade!mxgate!coyoacan!demon!snilsson From: snilsson@demon.co.uk (Sun-mi Nilsson) Newsgroups: comp.dsp Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb22.122723.7683@demon.co.uk> Date: Wed, 22 Feb 1995 12:27:23 GMT References: <1995Feb20.022223.7357@mindspring.com> <1995Feb21.022423.1829@inria.fr> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Feb21.022423.1829@inria.fr>, khernandez@inria.fr (Kirsty Hernández) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. 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. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Sun-mi Nilsson | snilsson@demon.co.uk PGP Key fingerprint: 9ACE B3B8 B8ED F09A "Keep the channels open."