From msanchez@pacbell.net Mon Jun 27 02:45:03 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!msanchez
From: msanchez@pacbell.net (Mathieu Sánchez)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Jun27.024503.5132@pacbell.net>
Date: Mon, 27 Jun 1994 02:45:03 GMT
Organization: Pacific Bell Internet Services
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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?

-- 
Mathieu Sánchez
Opinions expressed are solely my own and not those of Pacific Bell Internet Services.
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From jweber@cmu.edu Mon Jun 27 19:51:03 1994
Path: ashpoly!cascade!brgate!saturno!cmu!jweber
From: jweber@cmu.edu (Joachim Weber)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Jun27.195103.7663@cmu.edu>
Date: Mon, 27 Jun 1994 19:51:03 GMT
References: <1994Jun27.024503.5132@pacbell.net>
Organization: Carnegie Mellon University School of CS
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In article <1994Jun27.024503.5132@pacbell.net>, msanchez@pacbell.net (Mathieu Sánchez) 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.

-- 
Joachim Weber
Tape trading list upon request. SASE required for international mail.