blackmanharris function

Blackman-Harris window

Return the filter coefficients of a minimum four-term Blackman-Harris window.

blackmanharris(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.

Returns

Blackman-Harris window, returned as a vector.

Details

The Blackman window is a member of the family of cosine sum windows. It is a generalization of the Hamming family, produced by adding more shifted sinc functions, meant to minimize side-lobe levels.

Examples

b <- blackmanharris(64)
plot (b, type = "l", xlab = "Samples", ylab =" Amplitude")

bs = blackmanharris(64,'symmetric')
bp = blackmanharris(63,'periodic')
plot (bs, type = "l", xlab = "Samples", ylab =" Amplitude")
lines(bp, col="red")

Author(s)

Sylvain Pelissier, sylvain.pelissier@gmail.com .

Conversion to R by Geert van Boxtel, G.J.M.vanBoxtel@gmail.com .