From tsouza@mindspring.com Wed Oct 02 06:07:29 1996 Path: ashpoly!cascade!bigsur!mindspring!tsouza From: tsouza@mindspring.com (Thiago Souza) Newsgroups: comp.dsp Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Oct02.060729.7485@mindspring.com> Date: Wed, 02 Oct 1996 06:07:29 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 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 standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. MATLAB script available upon request via email. -- Thiago Souza | tsouza@mindspring.com PGP Key fingerprint: D20C 971F C8D3 B812 "Keep the channels open." From tokonkwo@unam.mx Wed Oct 02 09:53:29 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!tokonkwo From: tokonkwo@unam.mx (Tyler Okonkwo) Newsgroups: comp.dsp Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1996Oct02.095329.6543@unam.mx> Date: Wed, 02 Oct 1996 09:53:29 GMT References: <1996Oct02.060729.7485@mindspring.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Oct02.060729.7485@mindspring.com>, tsouza@mindspring.com (Thiago Souza) 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. -- Tyler Okonkwo *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0