User`s guide

Window Function
5-541
5Window Function
Purpose Compute a window, and/or apply a window to an input signal.
Library DSP Sources, Signal Operations
Description The Window Function block has three modes of operation, selected by the
Operation parameter as described below.
Operation Modes
In each mode, the block first creates a window vector, w, by sampling the
window specified in the
Window type parameter at M discrete points. The
Operation modes are:
•
Apply window to input
In this mode the block computes an M-by-1 window vector, w, and multiplies
the vector element-wise with each of the N channels in the M-by-N input
matrix u.
y = repmat(w,1,N) .* u % Equivalent MATLAB code
A length-M 1-D vector input is treated as an M-by-1 matrix. The output, y,
always has the same dimension as the input. If the input is frame-based, the
output is frame-based; otherwise, the output is sample-based.
•
Generate window
In this mode the block generates a sample-based 1-D window vector, w, with
length M specified by the
Window length parameter. The In port is disabled.
•
Generate and apply window
In this mode the block computes an M-by-1 window vector, w, and multiplies
the vector element-wise with each of the N channels in the M-by-N input
matrix u.
y = repmat(w,1,N) .* u % Equivalent MATLAB code
A length-M 1-D vector input is treated as an M-by-1 matrix. The block
produces two outputs:
- At the
Out port, the block produces the result of the multiplication, y,
which has the same dimension as the input. If the input is frame-based,
output y is frame-based; otherwise, output y is sample-based.
- At the
Win port, the block produces the M-by-1 window vector, w. Output w
is always sample-based.