信號(hào)與系統(tǒng)課程設(shè)計(jì)-文庫吧資料
2025-01-24 14:13本頁面
【正文】 et(AI,39。% Add channels Add one channel to AI.% Configure property values Assign values to the basic setup properties, and %create the variables blocksize and Fs, which are used for subsequent analysis. %The actual sampling rate is retrieved since it may be set by the engine to a %value that differs from the specified value.set(AI,39。)。源程序及運(yùn)行所得圖像如下：function xinhaoAI = analoginput(39。title(39。)。title(39。sound(x,fs,bits)X=fft(x,12000)。C:\Documents and Settings\Administrator\桌面\39。)題目二：方法一：用計(jì)算機(jī)的聲音編輯工具錄制一段語音信號(hào)，得到語音信號(hào)。)ylabel(39。)xlabel(39。) %繪出插零的頻譜圖title(39。對(duì)加窗后所得的5點(diǎn)序列，每隔一個(gè)點(diǎn)插一個(gè)零，源程序及運(yùn)行所得圖像如下：g=[1 0 1 0 1 0 1 0 1]G=fft(g,9) %進(jìn)行9點(diǎn)快速傅里葉變換n=0:8G(n+1)=Gstem(0:8,abs(G),39。)從情況二中的兩幅圖對(duì)比可以得出如下結(jié)論：若直流序列所加矩形窗的時(shí)域長度越長且對(duì)其補(bǔ)的零越短，對(duì)其進(jìn)行快速傅里葉變換后其頻譜越接近真實(shí)譜。)ylabel(39。)xlabel(39。)axis([0 100 0 100])title(39。endfor n=100:100 %補(bǔ)1個(gè)零 g(n+1)=0endG=fft(g,101) %進(jìn)行101點(diǎn)快速傅里葉變換stem(0:100,abs(G),39。\fontsize{14} \bfG（K） \rightarrow39。\fontsize{14} \bfK \rightarrow39。對(duì)100點(diǎn)的序列補(bǔ)上10個(gè)0并進(jìn)行110點(diǎn)快速傅里葉變換39。fill39。對(duì)100點(diǎn)的序列補(bǔ)上10個(gè)0，源程序及運(yùn)行所得圖像如下：for n=0:99 %對(duì)原序列加時(shí)域長度為100點(diǎn)的窗 g(n+1)=1。\fontsize{14} \bfG（K） \rightarrow39。\fontsize{14} \bfK \rightarrow39。對(duì)5點(diǎn)的序列補(bǔ)上105個(gè)0并進(jìn)行110點(diǎn)快速傅里葉變換39。fill39。對(duì)5點(diǎn)的序列補(bǔ)上105個(gè)0，源程序及運(yùn)行所得圖像如下：for n=0:
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