From krodriguez@tum.de Fri Apr 08 19:40:09 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!krodriguez
From: krodriguez@tum.de (Karen Rodríguez)
Newsgroups: comp.dsp
Subject: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Apr08.194009.5358@tum.de>
Date: Fri, 08 Apr 1994 19:40:09 GMT
Organization: Technische Universität München
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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.
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.

What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT?

-- 
Karen Rodríguez
Tape trading list upon request. SASE required for international mail.

From rrodriguez@unam.mx Sun Apr 10 17:03:09 1994
Path: ashpoly!cascade!transat!ukc!fennimore!unam!rrodriguez
From: rrodriguez@unam.mx (Raj Rodríguez)
Newsgroups: comp.dsp
Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Apr10.170309.4718@unam.mx>
Date: Sun, 10 Apr 1994 17:03:09 GMT
References: <1994Apr08.194009.5358@tum.de>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1994Apr08.194009.5358@tum.de>, krodriguez@tum.de (Karen Rodríguez) 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.

-- 
Raj Rodríguez
Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA).
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From dsilva@inria.fr Mon Apr 11 17:52:09 1994
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!dsilva
From: dsilva@inria.fr (Diego Silva)
Newsgroups: comp.dsp
Subject: Re: Observation: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Apr11.175209.7860@inria.fr>
Date: Mon, 11 Apr 1994 17:52:09 GMT
References: <1994Apr08.194009.5358@tum.de>
Organization: INRIA Rocquencourt
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In article <1994Apr08.194009.5358@tum.de>, krodriguez@tum.de (Karen Rodríguez) 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.

-- 
Diego Silva
Tape trading list upon request. SASE required for international mail.