Hamming Window

This is the sum of a rectangle and a Hanning window. An amplitude weighting of the time signal used with gated continuous signals to give them a slow onset and cut-off in order to reduce the generation of side lobes in their frequency spectrum. This window has similar properties to the Hanning window with the added feature that it suppresses the first sidelobe. However, the fall-off rate of the sidelobes is only 20dB per decade compared to 60dB per decade for the Hanning window.

amplitude correction = 1.855, energy correction = 1.586

In the time domain this function is shown below:

The frequency response of this window is shown along with that of a rectangular window for comparison:

See also: Blackman Window, Blackman-Harris Window, Bohman Window, Cauchy Window, Fast Fourier Transform, Hanning Window, Leakage, Rectangular Window, Windowing.

Weblinks:

Bruel & Kjaer - Technical Reviews These documents give detailed articles on measurement and signal processing theory.