B.1.13 Sine-Wave Generation; Figure B-11 Sine Wave Generator-Double Integration Technique - Motorola DSP56800 Manual

B.1.13 Sine-Wave Generation
The following two sine-wave generation benchmarks are provided:
• Double integration technique
• Second order oscillator
B.1.13.1 Double Integration Technique
Figure B-11 gives a graphical overview of the double integration technique.
a = Stored initial value which is the
desired tone amplitude
Figure B-11. Sine Wave Generator—Double Integration Technique
opt cc
clr b
move #$4000,a
move #0,n
move #$4532,y1
move #$1,r1
move y1,y0
do x0,loop1
mac y1,b1,a
mac -y0,a1,b
loop1
move
;
;
B-20
x0
a
T
y1 = 2*sin( π Fs/F0)
F0 = Oscillation Frequency
Fs = Sampling Frequency
b,x:(r1)+n
b,x:(r1)
Total:
DSP56800 Family Manual
T
sin(w t)
0
; 1 1
; 2 2
; 1 1
; 2 2
; 1 1
; 1 1
; 2 3
; 1 1
; 1 1
; 1 1
_______
13 2N+12
AA0089