From mpopov@kth.se Mon Feb 20 19:06:23 1995 Path: ashpoly!cascade!brgate!saturno!kth!mpopov From: mpopov@kth.se (Mike Popov) Newsgroups: comp.dsp Subject: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb20.190623.8377@kth.se> Date: Mon, 20 Feb 1995 19:06:23 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 10 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. 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? -- Mike Popov Tape trading list upon request. SASE required for international mail. From lmartinez@delphi.com Tue Feb 21 11:38:23 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!lmartinez From: lmartinez@delphi.com (Lisa Martínez) Newsgroups: comp.dsp Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb21.113823.8394@delphi.com> Date: Tue, 21 Feb 1995 11:38:23 GMT References: <1995Feb20.190623.8377@kth.se> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Feb20.190623.8377@kth.se>, mpopov@kth.se (Mike Popov) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. > 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. -- Lisa Martínez -- Delphi Internet Services "Measuring a record you own is listening, not piracy." From cokonkwo@cern.ch Thu Feb 23 07:45:23 1995 Path: ashpoly!cascade!bigsur!cern!cokonkwo From: cokonkwo@cern.ch (Camila Okonkwo) Newsgroups: comp.dsp Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb23.074523.1665@cern.ch> Date: Thu, 23 Feb 1995 07:45:23 GMT References: <1995Feb20.190623.8377@kth.se> <1995Feb21.113823.8394@delphi.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Feb21.113823.8394@delphi.com>, lmartinez@delphi.com (Lisa Martínez) 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. -- Camila Okonkwo Tape trading list upon request. SASE required for international mail. From tramirez@panix.com Thu Feb 23 16:42:23 1995 Path: ashpoly!cascade!mxgate!coyoacan!panix!tramirez From: tramirez@panix.com (Tomas Ramírez) Newsgroups: comp.dsp Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb23.164223.5960@panix.com> Date: Thu, 23 Feb 1995 16:42:23 GMT References: <1995Feb20.190623.8377@kth.se> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Feb20.190623.8377@kth.se>, mpopov@kth.se (Mike Popov) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. > 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. PGP Public key available via finger or upon request. -- Tomas Ramírez *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From fnovak@titech.ac.jp Thu Feb 23 21:00:23 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!titech!fnovak From: fnovak@titech.ac.jp (Freya Novak) Newsgroups: comp.dsp Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb23.210023.8792@titech.ac.jp> Date: Thu, 23 Feb 1995 21:00:23 GMT References: <1995Feb20.190623.8377@kth.se> <1995Feb21.113823.8394@delphi.com> <1995Feb23.074523.1665@cern.ch> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Feb23.074523.1665@cern.ch>, cokonkwo@cern.ch (Camila Okonkwo) 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. PGP Public key available via finger or upon request. -- Freya Novak "When every node is whole, the channel opens." Amiga 1200 (Blizzard 030/50) / Linux 1.2.13