hann {gsignal}

Hann window

Description

Return the filter coefficients of a Hann window of length n.

Usage

hann(n, method = c("symmetric", "periodic"))

hanning(n, method = c("symmetric", "periodic"))

Arguments

n

Window length, specified as a positive integer.

method

Character string. Window sampling method, specified as:

"symmetric"

(Default). Use this option when using windows for filter design.

"periodic"

This option is useful for spectral analysis because it enables a windowed signal to have the perfect periodic extension implicit in the discrete Fourier transform. When "periodic" is specified, the function computes a window of length n + 1 and returns the first n points.

Details

The Hann window is a member of the family of cosine sum windows. It was named after Julius von Hann, and is sometimes referred to as Hanning, presumably due to its linguistic and formulaic similarities to Hamming window.

Value

Hann window, returned as a vector.

Author(s)

Andreas Weingessel, [e-mail].
Conversion to R by Geert van Boxtel [e-mail].

Examples

h <- hann(64)
plot (h, type = "l", xlab = "Samples", ylab =" Amplitude")

hs = hann(64,'symmetric')
hp = hann(63,'periodic')
plot (hs, type = "l", xlab = "Samples", ylab =" Amplitude")
lines(hp, col="red")