ChapterW_trapezoid

W_trapezoid

Trapezoid window.

Loading LOADSUB ALL FROM "W_TRAPEZ.HTS"

or LOADSUB FROM "MATHLIB.HTS"

or LOADSUB W_trapezoid FROM "MATHLIB.HTS"

Usage REAL A(*),B(*)

REAL H,P

CALL W_trapezoid(A(*),H,P,B(*))

Description

W_trapezoid multiplies the sequence in array A by a trapezoid window function of parameters p and h and returns the product in array B. Array A is unmodified. H is the peak-to-peak amplitude of the untruncated trapezoid portion of the window. P is the value of the pedestal portion of the window. H and p must be between 0 and 1, inclusive.

The window generated by the W_bartlett routine is a special case of the trapezoid window, with p = 0 and h = 1.

Errors Trapezoid window for h=0.875 and N=128

W_trapezoid causes an HTBasic error if its arguments are not of the types listed in the USAGE section, above, or if h and p are not in the ranges discussed above.

See Also

Waveform, W_bartlett