均勻與非均勻量化-資料下載頁
2025-07-23 23:59本頁面
【正文】 n))。%求量化信噪比t=(0:2*pi/N:2*pi)。aaq=sin(0:2*pi/N:2*pi)。%計(jì)算所有采樣點(diǎn)的量化值，為作圖服務(wù)aq=mulaw(aaq,u)。aq_quan=aq/amax。%歸一化aq=d.*[0:n1]。aq=((n1)/2)*daq。%量化電平for i=1:naq_quan(find((q(i)d/2=aq_quan) amp。 (aq_quan=q(i)+d/2)))=...%定位第i個(gè)量化間隔碼子q(i).*ones(1,length(find((q(i)d/2=aq_quan)amp。(aq_quan=q(i)+d/2))))。%賦值為相應(yīng)的量化電平endaaq_quan=invmulaw(aq_quan,u)。figure(1)%作原始信號(hào)及量化曲線set(1,39。position39。,[10,50,300,200])plot(t,sin(t))grid onaxis([0,2*pi,*amax,*amax])title(39。原始信號(hào)及量化曲線39。)xlabel(39。t39。)ylabel(39。原始信號(hào)及量化信號(hào)值39。)text(2,1,39。sin(t)39。)hold onplot(t,aaq_quan,39。r39。)figure(2)%做量化誤差曲線(對(duì)所有采樣點(diǎn))set(2,39。position39。,[350,50,300,200])plot(t,aaq_quansin(t))grid onaxis([0,2*pi,*amax,*amax])title(39。量化誤差曲線39。)xlabel(39。t39。)ylabel(39。量化誤差值39。)figure(3)%做前十個(gè)取樣點(diǎn)的量化值曲線及表示量化信噪比(量化信噪比的計(jì)算依據(jù)一個(gè)周期內(nèi)所有取樣點(diǎn)，并非前十個(gè))set(1,39。position39。,[20,60,300,200])stem(aa_quan)grid onaxis([0,amax,amax])title(39。量化值及編碼顯示39。)xlabel(39。num39。)ylabel(39。量化值及編碼顯示39。)for k=1:MCODA=num2str(code(k,:))。text(k+,aa_quan(k)+,CODA)text(7,*amax,39。量化信噪比=39。)text(,*amax,num2str(sqnr))end
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