From mlindqvist@mindspring.com Mon Nov 06 21:28:08 1995 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!mlindqvist From: mlindqvist@mindspring.com (Mathieu Lindqvist) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov06.212808.9978@mindspring.com> Date: Mon, 06 Nov 1995 21:28:08 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. 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? -- Mathieu Lindqvist US Robotics Courier V.34 @ 14,400 bps "They will send a copy in my place." From lschneider@berkeley.edu Tue Nov 07 16:47:08 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!berkeley!lschneider From: lschneider@berkeley.edu (Lisa Schneider) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov07.164708.1042@berkeley.edu> Date: Tue, 07 Nov 1995 16:47:08 GMT References: <1995Nov06.212808.9978@mindspring.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov06.212808.9978@mindspring.com>, mlindqvist@mindspring.com (Mathieu Lindqvist) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. > A Kaiser-Bessel window with parameter beta = 8.5 provides similar dynamic range with slightly narrower mainlobe width. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Lisa Schneider US Robotics Courier V.34 @ 9600 Telebit bps "A soul is not exclusive to biology." From swatanabe@uni-hamburg.de Tue Nov 07 19:41:08 1995 Path: ashpoly!cascade!bigsur!uni-hamburg!swatanabe From: swatanabe@uni-hamburg.de (Seo-yeon Watanabe) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov07.194108.1752@uni-hamburg.de> Date: Tue, 07 Nov 1995 19:41:08 GMT References: <1995Nov06.212808.9978@mindspring.com> <1995Nov07.164708.1042@berkeley.edu> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Nov07.164708.1042@berkeley.edu>, lschneider@berkeley.edu (Lisa Schneider) 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. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Seo-yeon Watanabe "When every node is whole, the channel opens." Commodore Amiga 500 (1MB OCS) / FreeBSD 2.1 From npark@utexas.edu Wed Nov 08 02:09:08 1995 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!npark From: npark@utexas.edu (Natalia Park) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov08.020908.4547@utexas.edu> Date: Wed, 08 Nov 1995 02:09:08 GMT References: <1995Nov06.212808.9978@mindspring.com> <1995Nov07.164708.1042@berkeley.edu> <1995Nov07.194108.1752@uni-hamburg.de> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Nov07.194108.1752@uni-hamburg.de>, swatanabe@uni-hamburg.de (Seo-yeon Watanabe) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. > Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Natalia Park Zyxel U-1496E @ 28,800 bps "Tape doesn't lie at 02:14. Ears do." From kgirard@netcom.com Fri Nov 10 05:34:08 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!kgirard From: kgirard@netcom.com (Kirsty Girard) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Nov10.053408.5476@netcom.com> Date: Fri, 10 Nov 1995 05:34:08 GMT References: <1995Nov06.212808.9978@mindspring.com> <1995Nov07.164708.1042@berkeley.edu> <1995Nov07.194108.1752@uni-hamburg.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Nov07.194108.1752@uni-hamburg.de>, swatanabe@uni-hamburg.de (Seo-yeon Watanabe) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Kirsty Girard *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0