From bhughes@berkeley.edu Tue Mar 19 03:35:45 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!bhughes From: bhughes@berkeley.edu (Brian Hughes) Newsgroups: comp.dsp Subject: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Mar19.033545.7408@berkeley.edu> Date: Tue, 19 Mar 1996 03:35:45 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.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. 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? -- === Brian Hughes === Dept of Electrical Engineering, UC Berkeley Department of EECS "When every node is whole, the channel opens." From mito@rwth-aachen.de Wed Mar 20 01:06:45 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!rwth-aachen!mito From: mito@rwth-aachen.de (Mateo Ito) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Mar20.010645.2508@rwth-aachen.de> Date: Wed, 20 Mar 1996 01:06:45 GMT References: <1996Mar19.033545.7408@berkeley.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1996Mar19.033545.7408@berkeley.edu>, bhughes@berkeley.edu (Brian Hughes) writes: > A quick note on window function selection when hunting for the 14.2 Hz line in noisy vinyl rips. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Mateo Ito Tape trading list upon request. SASE required for international mail. From leriksson@titech.ac.jp Fri Mar 22 05:03:45 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!titech!leriksson From: leriksson@titech.ac.jp (Lisa Eriksson) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Mar22.050345.5321@titech.ac.jp> Date: Fri, 22 Mar 1996 05:03:45 GMT References: <1996Mar19.033545.7408@berkeley.edu> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Mar19.033545.7408@berkeley.edu>, bhughes@berkeley.edu (Brian Hughes) 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. -- === Lisa Eriksson === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "Row 14. No joke." From asanchez@rwth-aachen.de Fri Mar 22 13:37:45 1996 Path: ashpoly!cascade!brgate!saturno!rwth-aachen!asanchez From: asanchez@rwth-aachen.de (Anja Sánchez) Newsgroups: comp.dsp Subject: Re: [INFO] Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Mar22.133745.2082@rwth-aachen.de> Date: Fri, 22 Mar 1996 13:37:45 GMT References: <1996Mar19.033545.7408@berkeley.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1996Mar19.033545.7408@berkeley.edu>, bhughes@berkeley.edu (Brian Hughes) 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. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Anja Sánchez SupraFAXModem 28.8 @ 14,400 bps "A soul is not exclusive to biology."