sigwin.triang Class

Namespace: sigwin

Construct triangular window object

Description

Note

The use of sigwin.triang is not recommended. Use triang instead.

sigwin.triang is a triangular window object.

sigwin.triang creates a handle to a triangular 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.

For L odd, the triangular window is defined as:

$$w(n)=\{\begin{array}{ll}\frac{2n}{L+1}\hfill & 1\le n\le \frac{L+1}{2}\hfill \\ 2-\frac{2n}{L+1}\hfill & \frac{L+1}{2}+1\le n\le L\hfill \end{array}$$

For L even, the triangular window is defined as:

$$w(n)=\{\begin{array}{ll}\frac{(2n-1)}{L}\hfill & 1\le n\le \frac{L}{2}\hfill \\ 2-\frac{(2n-1)}{L}\hfill & \frac{L}{2}+1\le n\le L\hfill \end{array}$$

Construction

H = sigwin.triang returns a triangular window object H of length 64.

H = sigwin.triang(Length) returns a triangular window object H of length Length. Entering a positive non-integer 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.

Properties

Length

Triangular window length. The window length requires a positive integer. Entering a positive non-integer 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.

Methods

generate	Generates triangular window
info	Display information about triangular window
winwrite	Save triangular window in ASCII file

Copy Semantics

Handle. To learn how copy semantics affect your use of the class, see Copying Objects in the MATLAB^® Programming Fundamentals documentation.

Examples

Triangular Window

Generate a triangular window of length N = 16. Return its values as a column vector. Show information about the window object. Display the window.

H = sigwin.triang(16);

win = generate(H)

win = 16×1

    0.0625
    0.1875
    0.3125
    0.4375
    0.5625
    0.6875
    0.8125
    0.9375
    0.9375
    0.8125
    0.6875
    0.5625
    0.4375
    0.3125
    0.1875
      ⋮

wininfo = info(H)

wininfo = 3×17 char array
    'Triangular Window'
    '-----------------'
    'Length  : 16     '

wvtool(H)

References

Oppenheim, Alan V., and Ronald W. Schafer. Discrete-Time Signal Processing. Upper Saddle River, NJ: Prentice Hall, 1989.