Construct Hann (Hanning) window object
The use of
sigwin.hann creates a handle to a Hann window
object for use in spectral analysis and FIR filtering by the window
method. Object methods enable workspace import and ASCII file export
of the window values.
The symmetric Hann window of length
N is defined as:
N even and
The second half of the symmetric Hann window is obtained by flipping the first half around the midpoint. The symmetric option is the preferred method when using a Hann window in FIR filter design.
The periodic Hann window is constructed by extending the desired window length by one sample, constructing a symmetric window, and removing the last sample. The periodic version is the preferred method when using a Hann window in spectral analysis because the discrete Fourier transform assumes periodic extension of the input vector.
H = sigwin.hann returns a symmetric Hann
H of length 64.
H = sigwin.hann( returns a symmetric Hann window object with length
a positive integer. Entering a positive noninteger value for
Length rounds the length to the nearest integer. Entering
a 1 for
Length results in a window with
a single value of 1.
H = sigwin.hann( returns a Hann window object
SamplingFlag can be either
Hann window length. Must be a positive integer. Entering a positive
noninteger value for
|generate||Generates Hann window|
|info||Display information about Hann window object|
|winwrite||Save Hann window object values in ASCII file|
Handle. To learn how copy semantics affect your use of the class, see Copying Objects in the MATLAB® Programming Fundamentals documentation.
N = 64 symmetric Hann window:
H = sigwin.hann; wvtool(H)
N=128 periodic Hann window,
return values, and write ASCII file:
H = sigwin.hann(128,'periodic'); % Return window with generate win = generate(H); % Write ASCII file in current directory % with window values winwrite(H,'hann_128')
Oppenheim, Alan V., and Ronald W. Schafer. Discrete-Time Signal Processing. Upper Saddle River, NJ: Prentice Hall, 1989.