Stereo System User Manual

MOTOROLA DSP96002 USER’S MANUAL B-33
SINGLE SECTION
EQUATIONS:
t’=t-k
*
s
s’=s+k
*
t’
t’→t
output= sum(s’
*
w)
DSP56000 IMPLEMENTATION
Program ICycles
Words
move #k,r0 ;point to coefficients
move #2
*
N,m0 ;mod 2
*
(# of k’s)+1
move #state,r4 ;point to filter states
move #N,m4 ;mod on filter states
movep y:datin,a ;get input sample
move x:(r0)+,x0 y:(r4)-,y0 ;get first k, first s 1 1
do #N,_el ;do filter 2 3
macr -x0,y0,a b,y:(r4)+ ;t-k
*
s, save prev s 1 1
move a,x1 y:(r4)+,b ;copy t’,get s again 1 1
macr x1,x0,b x:(r0)+,x0 y:(r4)-,y0 ;t’
*
k+s,get k,get s 1 1
_el
move b,y:(r4)+ ;sv scnd to 1st st 1 1
clr a a,y:(r4)+ ;save first state 1 1
move y:(r4)+,y0 ;get last state 1 1
rep #N 1 2
mac x0,y0,a x:(r0)+,x0 y:(r4)+,y0 ;do fir taps 1 1
macr x0,y0,a (r4)+ ;finish, adj pointer 1 1
movep a,y:datout ;output sample
--- ---
Totals: 12 4N+10
DSP96002 IMPLEMENTATION
∑
∑
Z
-1
tt’
s’
s
w
k
k’