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LAB
Windowing and its Types

Anokhi
18-2-2015

Aim: To understand windowing and analysis different window types
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But for non-periodic signals this is not the case
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This leakage may even distort the original frequency spectrum or increase the
frequency range
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Windowing:
A window basically a function is applied to a signal in time domain to make it periodic
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It is shaped such that it is exactly 0 in the
beginning than takes some special shape and again decays to 0 at the end
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Hence the lobes in frequency domain
which are comparatively far from the original frequency component are removed
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Hamming and Hanning windows:
-> Both are similar shaped window types except that the main difference between them is their
convergence at the edge
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Hence Hamming window still has some
discontinuity
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The peak we
obtain in both is essentially almost similar
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Blackman Window:
->There exists extra cosine term in Blackman window function which reduces side lobes more than
Hamming and Hanning window
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Hence
their being more terms in the function of Blackman window it provides more accurate results than
Hamming and Hanning window
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Bartlett Window:
->The Bartlett window is triangular shaped
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Hence the removal of side lobes with
unnecessary frequency components is difficult to avoid
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Rectangle Window:
->It is the simplest form of windowing
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These sudden changes has undesirable responses in frequency
domain hence there are changes made to the function and converted to better window like hamming
or any other

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