Subject: Re: [linux-audio-user] Noise Reduction experience?
From: Juhana Sadeharju (kouhia_AT_nic.funet.fi)
Date: Tue Jul 30 2002 - 16:49:32 EEST
>> I have already tried Audacity's built in noise
>> reduction effect. It is very easy to use, but the resulting file has
>> some noticeable sonic type noise (sort of a low level whistling)
>> during the quite passages. This occurs even when I apply a small level
>> of NR.
Low level whistling comes from FFT based NR methods when the size of FFT
is large. I did read this from Journal of AES paper describing
Lucasfilm's NR method (year 1986 something). They used 256 pins FFT but
they reduced the whistling by mixing the original audio with the
processed audio. The paper documented their 4 band (overlapping) NR
method too, anyone interested?
Juhana
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