From nreyes@stanford.edu Sun Nov 03 05:32:44 1996 Path: ashpoly!cascade!brgate!saturno!stanford!nreyes From: nreyes@stanford.edu (Nadia Reyes) Newsgroups: comp.dsp Subject: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov03.053244.1537@stanford.edu> Date: Sun, 03 Nov 1996 05:32:44 GMT Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. 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. MATLAB script available upon request via email. -- Nadia Reyes "There are 14 nodes and only 10 countries. Count again." PC-9821Ap2 (NEC) / Linux 1.2.13 From mvasiliev@purdue.edu Mon Nov 04 07:29:44 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!mvasiliev From: mvasiliev@purdue.edu (Matthias Vasiliev) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov04.072944.4496@purdue.edu> Date: Mon, 04 Nov 1996 07:29:44 GMT References: <1996Nov03.053244.1537@stanford.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Nov03.053244.1537@stanford.edu>, nreyes@stanford.edu (Nadia Reyes) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Matthias Vasiliev Tape trading list upon request. SASE required for international mail. From gsato@demon.co.uk Tue Nov 05 22:12:44 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!demon!gsato From: gsato@demon.co.uk (Göran Sato) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov05.221244.2998@demon.co.uk> Date: Tue, 05 Nov 1996 22:12:44 GMT References: <1996Nov03.053244.1537@stanford.edu> <1996Nov04.072944.4496@purdue.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Nov04.072944.4496@purdue.edu>, mvasiliev@purdue.edu (Matthias Vasiliev) 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. -- Göran Sato -- Demon Internet Services UK "The carrier frequency does not drift by accident." From ieriksson@demon.co.uk Thu Nov 07 16:03:44 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!ieriksson From: ieriksson@demon.co.uk (Ines Eriksson) Newsgroups: comp.dsp Subject: Re: Discussion: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Nov07.160344.9521@demon.co.uk> Date: Thu, 07 Nov 1996 16:03:44 GMT References: <1996Nov03.053244.1537@stanford.edu> <1996Nov04.072944.4496@purdue.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Nov04.072944.4496@purdue.edu>, mvasiliev@purdue.edu (Matthias Vasiliev) 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. -- === Ines Eriksson === Dept of Electrical Engineering, Demon Internet Services UK "When every node is whole, the channel opens."