基于simulink的DDS信号发生器仿真+操作录像

function [y,t]=dds_matlab(fout,Fs,Bits,endtime) % Output some infomation delta_F=Fs/2^Bits; disp(['The frequency resolution of this DDS is:'... ,num2str(delta_F),'Hz']); disp(['Output frequencies are:0Hz,',num2str(delta_F),'Hz,'... num2str(2*delta_F),'Hz,......,',num2str(Fs/2),'Hz']); % Construct the Sine Wave LUT store in array LUT t=2*pi*(0:2^Bits-1)/2^Bits; LUT=sin(t); t=0:1/Fs:endtime; N=length(t); n=1; y=zeros(1,N); IND=zeros(1,N); % Input Frequency Word k=floor(fout/Fs*2^Bits); index=0; while n<=N IND(n)=index; index=index+k; index=mod(index,2^Bits); n=n+1; end IND=IND+1; y=LUT(IND); plot(t,y); figure(1); axis([0 endtime -1.2 1.2]); grid on