求一份matlab数模转换，模数转换代码

clear

clc

f0=10000     

f=[10 50 100] 

fs=500        

N=500        

num=length(f)

s=zeros(1,N)

for i=1:num

    s=s+sin(f(i)*2*pi*(1:N)/f0)

end

plot(s,'携槐Color',[73 86 142]./255, 'LineWidth',2)axis([1 N/2 min(s) max(s)])

deltaN=f0/fs

Ns=N/deltaN

for i=1:Ns

    sd(i)=s((i-1)*deltaN+1)

end

sp=[]

for 辩灶友i=1:Ns

    sp=[sp sd(i)*ones(1,deltaN)]

end

hold on

plot(sp,'Color',[87 141 98]./255,'辩戚LineWidth',2)axis([1 N/2 min(s) max(s)])

Wm=fs/f0

level=5/Wm

Nm=ceil(Wm/2*level)

H=zeros(1,level)

H(1:Nm)=ones(1,Nm)

H(Nm+1)=0.5

H(level-Nm+1)=-0.5

H(level-Nm+2:level)=-ones(1,Nm-1)

theta=-(level-1)/level*pi*(0:level-1) 

Hg=H.*exp(j*theta)

b=real(ifft(Hg))

b=b/(sum(b.^2))

delay=level/2

sp=[sp zeros(1,delay)]

so=filter(b,1,sp)

so=so(delay+1:delay+N)/deltaN

plot(so,'Color',[212 57 63]./255,'LineWidth',2)axis([1 N/2 min(s) max(s)])

grid on

close all

clear all

a=4

f0=0.02

L=50

n=1:(L-1)

x=a.*cos(2.*pi.*f0.*n)

bit=5

range=2^5

plot(x)

interval=(a*2)/(range-1)

partition = [-a:interval:a]

interval2 = (a*2)/(range)

codebook=[-a:interval2:a]

[index quantized]= quantiz(x,partition,codebook)

plot(n,x,'升渣x',n,quantized,'.')

legend('Original signal'轮滚,'Quantized signal')

%index为输出5bit输出数字信号

%下面从index到output

output=(index-16)/4

figure

plot(n,x,n,output)

legend('吵桐悄Original signal','Output signal')