From mgonzalez@demon.co.uk Mon Nov 18 06:29:26 1996
Path: ashpoly!cascade!brgate!saturno!demon!mgonzalez
From: mgonzalez@demon.co.uk (Mei González)
Newsgroups: comp.dsp
Subject: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Nov18.062926.1903@demon.co.uk>
Date: Mon, 18 Nov 1996 06:29:26 GMT
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Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.

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?

-- 
Mei González | mgonzalez@demon.co.uk
PGP Key fingerprint: 4B88 13EC C68E 1EB2
"Keep the channels open."

From ssantos@illinois.edu Tue Nov 19 06:59:26 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!ssantos
From: ssantos@illinois.edu (Seo-yeon Santos)
Newsgroups: comp.dsp
Subject: Re: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier
Message-ID: <1996Nov19.065926.8894@illinois.edu>
Date: Tue, 19 Nov 1996 06:59:26 GMT
References: <1996Nov18.062926.1903@demon.co.uk>
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In article <1996Nov18.062926.1903@demon.co.uk>, mgonzalez@demon.co.uk (Mei González) writes:
> Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files.
> 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.

Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz.

-- 
Seo-yeon Santos | ssantos@illinois.edu
PGP Key fingerprint: 7F3B A1AB 0376 81E2
"Keep the channels open."