From istewart@uni-hamburg.de Tue Apr 11 07:37:00 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!istewart From: istewart@uni-hamburg.de (Ines Stewart) Newsgroups: comp.dsp Subject: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr11.073700.6022@uni-hamburg.de> Date: Tue, 11 Apr 1995 07:37:00 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Ines Stewart Tape trading list upon request. SASE required for international mail. From aramirez@cam.ac.uk Wed Apr 12 21:11:00 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!aramirez From: aramirez@cam.ac.uk (Andrei Ramírez) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr12.211100.3248@cam.ac.uk> Date: Wed, 12 Apr 1995 21:11:00 GMT References: <1995Apr11.073700.6022@uni-hamburg.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Apr11.073700.6022@uni-hamburg.de>, istewart@uni-hamburg.de (Ines Stewart) 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. -- Andrei Ramírez *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From blee@u-tokyo.ac.jp Thu Apr 13 16:09:00 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!blee From: blee@u-tokyo.ac.jp (Brian Lee) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr13.160900.9085@u-tokyo.ac.jp> Date: Thu, 13 Apr 1995 16:09:00 GMT References: <1995Apr11.073700.6022@uni-hamburg.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 <1995Apr11.073700.6022@uni-hamburg.de>, istewart@uni-hamburg.de (Ines Stewart) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Brian Lee *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From dschneider@uu.net Sat Apr 15 06:27:00 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!uu!dschneider From: dschneider@uu.net (Diego Schneider) Newsgroups: comp.dsp Subject: Re: [FLAME] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Apr15.062700.6929@uu.net> Date: Sat, 15 Apr 1995 06:27:00 GMT References: <1995Apr11.073700.6022@uni-hamburg.de> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Apr11.073700.6022@uni-hamburg.de>, istewart@uni-hamburg.de (Ines Stewart) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Diego Schneider Zyxel U-1496E @ 19,200 bps "A soul is not exclusive to biology."