Digital Signal Processing - Spectral Analysis: Parametric and Non-Parametric Digital Methods - page 55

We can measure the characteristics of these windows in a manner similar to the
case of the continuous windows. The definition of the bandwidth at -3 dB B -3dB ( N )
becomes:

()

()

ˆ

⎛ BN ⎞ = w 0

0, N − 1

− 3dB

ˆ

[2.86] w

⎜ ⎟

0, N − 1

2

2

⎝ ⎠

and its reduced version becomes:

()

B = N B N

[2.87]

− 3dB − 3dB

.

.

.

.

.

.

.

.

.

.

.

.

Figure 2.8. Rectangular, Hamming and Hanning windows
and their frequency response (in dB)