From sramirez@tum.de Mon Apr 25 23:03:03 1994
Path: ashpoly!cascade!transat!ukc!fennimore!tum!sramirez
From: sramirez@tum.de (Seo-yeon Ramírez)
Newsgroups: comp.dsp
Subject: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Apr25.230303.9638@tum.de>
Date: Mon, 25 Apr 1994 23:03:03 GMT
Organization: Technische Universität München
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Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz.

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.

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

-- 
Seo-yeon Ramírez
Tape trading list upon request. SASE required for international mail.

From lkuznetsov@illinois.edu Tue Apr 26 15:15:03 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!lkuznetsov
From: lkuznetsov@illinois.edu (Lars Kuznetsov)
Newsgroups: comp.dsp
Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1994Apr26.151503.6224@illinois.edu>
Date: Tue, 26 Apr 1994 15:15:03 GMT
References: <1994Apr25.230303.9638@tum.de>
Organization: University of Illinois Urbana-Champaign
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In article <1994Apr25.230303.9638@tum.de>, sramirez@tum.de (Seo-yeon Ramírez) writes:
> Don't use rectangular or Bartlett windows if you want reliable PSD estimates around 14 Hz.

Don't forget that if you downsample to 64 Hz first, your FFT resolution jumps to 0.015 Hz per bin with a modest 4096-point transform.

-- 
Lars Kuznetsov
Opinions expressed are solely my own and not those of University of Illinois Urbana-Champaign.
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