MATLAB.zip_MATLAB量化误差_matlablianghua_matlab均匀量化_均匀量化 仿真_采样量化

fs=2000; t=0:1/fs:1; x=sin(2*pi*t); delta=2/8; abs_xq=ceil(abs(x)/delta).*delta-delta/2; signx=2*(x>0)-1; xq=abs_xq.*signx; figure; plot(t,x); hold on; grid on; plot(t,xq,'r'); xlabel('t(s)'),title('输入信号和量化信号'); figure; subplot(2,1,1); plot(t,x); hold on; grid on; stem(t,xq,'r'); hold on; grid on; stem(t,x,'b'); xlabel('t(s)'),title('采样样值和8级均匀量化后的样值'); subplot(2,1,2); stem(t,xq-x,'r','filled'); xlabel('t(s)'),title('量化误差'); figure; SNR=zeros(1,7); x=sin(2*pi*t); signx=2*(x>0)-1; S0=mean(x.^2); for n=2:1:8 M=2^n; delta=2/M; abs_xq=ceil(abs(x)/delta).*delta-delta/2; xq=abs_xq.*signx; Nq=mean((x-xq).^2); SNR(n-1)=10*log10(S0/Nq); end; n=2:1:8; plot(n,SNR,'r'); hold on; grid on; S_NR=6.02*n+1.76; plot(n,S_NR,'b'); xlabel('编码位数'),ylabel('量化信噪比(dB)'),title('均匀量化信噪比随编码位数变化');