20 lines
497 B
Text
20 lines
497 B
Text
|
#lang scribble/manual
|
||
|
|
@(require (for-label racket))
|
||
|
|
|
||
|
|
@title{(dif-sqr a b)}
|
||
|
|
|
||
|
|
Difference of squares. Return the value of (a*a) - (b*b). This is
|
||
|
|
more efficient than using separate unit generators for each
|
||
|
|
operation.
|
||
|
|
|
||
|
|
(audition
|
||
|
|
(out 0 (mul (dif-sqr (f-sin-osc ar 800 0)
|
||
|
|
(f-sin-osc ar (x-line kr 200 500 5 do-nothing) 0))
|
||
|
|
0.125)))
|
||
|
|
|
||
|
|
(audition
|
||
|
|
(out 0 (let ((a (f-sin-osc ar 800 0))
|
||
|
|
(b (f-sin-osc ar (x-line kr 200 500 5 do-nothing) 0)))
|
||
|
|
(mul (sub (mul a a) (mul b b)) 0.125))))
|
||
|
|
|