速成讲义 TI C54xx DSP 十天速成讲义     实验7.1 FIR ;============================================================= ; fir4.asm ;用用循环缓冲区和双操作数寻址方法实现FIR滤波器 ;先用matlab，选择80点汉明窗设计一个截止频率为0.2π的低通滤波器 ; 本例与前不同的是系数直接引用程序存储器的系数表 ;N=5 y(n)=h0*x(n)+h1*x(n-1)+h2*x(n-2)+h3*x(n-3)+h4*x(n-4) ;============================================================= .title "fir4.asm" .mmregs .def start ;分配数据存储区 .bss y,1 ;y xn .usect "xn",80 ;xn h .usect "h",80 ;h PA0 .set 0000H ;数据输出端口 PA1 .set 0001H ;数据输入端口 ;参数表 .data table: .word -7,-18,-24,-22,-9,11,33,48 ;已在Matlab中转成十六进制的小数 .word 46,20,-24,-73,-104,-97,-43,49 .word 146,204,187,81,-91,-268,-371,-337 .word -144,162,476,661,603,261,-297,-894 .word -1283,-1222,-562,697,2373,4142,5618,6456 .word 6456,5618,4142,2373,697,-562,-1222,-1283 .word -894,-297,261,603,661,476,162,-144 .word -33……