# HannPoissonWindow

represents a HannPoisson window function of x.

HannPoissonWindow[x,α]

uses the parameter α.

# Details • HannPoissonWindow is a window function typically used in signal processing applications where data needs to be processed in short segments.
• Window functions have a smoothing effect by gradually tapering data values to zero at the ends of each segment.
• • HannPoissonWindow[x,α] is equal to .
• is equivalent to HannPoissonWindow[x,1].
• HannPoissonWindow automatically threads over lists.

# Examples

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## Basic Examples(3)

Shape of a 1D HannPoisson window:

Shape of a 2D HannPoisson window:

Extract the continuous function representing the HannPoisson window:

Parameterized HannPoisson window:

## Scope(6)

Evaluate numerically:

Shape of a 1D HannPoisson window using a specified parameter:

Variation of the shape as a function of the parameter α:

Translated and dilated HannPoisson window:

2D HannPoisson window with a circular support:

Discrete HannPoisson window of length 15:

Discrete 15×10 2D HannPoisson window:

## Applications(3)

Create a moving average filter of length 21:

Taper the filter using a Hamming window:

Log-magnitude plot of the power spectra of the filters:

Use a window specification to calculate sample PowerSpectralDensity:

Calculate the spectrum:

Compare to spectral density calculated without a windowing function:

The plot shows that window smooths the spectral density:

Compare to the theoretical spectral density of the process:

Use a window specification for time series estimation:

Specify window for spectral estimator:

## Properties & Relations(3)

HannPoissonWindow[x,0] is equivalent to a Hann window:

The area under the HannPoisson window:

Normalize to create a window with unit area:

Fourier transform of the HannPoisson window:

Power spectrum of the HannPoisson window:

## Possible Issues(1)

2D sampling of HannPoisson window will use a different parameter for each row of samples when passed as a symbol to Array: