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.

amplitude correction = 2.0, energy correction = 1.633

The Hanning window is a general purpose window for the analysis of continuous signals and should be used in most cases, because it has the best overall filter characteristic. The Hanning window may also be used for system analysis (frequency response measurements) - for both excitation and response signal when a random excitation signal is used.

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: Fast Fourier Transform, Flattop Window, Hamming Window, Hanning-Poisson Window, Kaiser Bessel Window, Leakage, Windowing.

Weblinks:

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