Re: Secondary Harmonics
"Raimund Specht" <>
Tue, 03 Jun 2003 23:15:18 -0000
Walter Knapp wrote:
> The harmonics can also not exist at all, but be a result of the
> that created the sonogram. In which case filtering will make no
> difference at all. Not everything on a sonogram is really there.
> only are there false "harmonics",
Yes, real-time spectrogram applications may add spurious harmonics
because they need to use simpler algorithms in order to execute fast
enough on slower machines. However, a good off-line spectrogram
software should not introduce any false harmonics.
> but a lot of the spatter around a loud
> call is not there either.
These "side lobes" can be reduced by using either a Flattop or a
Blackman window instead of the common Hamming window.
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