課程設(shè)計-基于matlab的語音信號分析與處理的課程設(shè)計實驗報告-在線瀏覽
2025-03-10 17:16本頁面
【正文】 坐標(biāo)軸上以黑線畫出濾波器的頻率響應(yīng)。e:\39。fp=2000。rp=。fc=40000。ws=2*fs/fc。value39。[num,den]=butter(N,Wc,39。)。else [N,Wc]=cheb1ord(wp,ws,rp,rs)。high39。endx=filter(num,den,y)。X=fft(x)。plot(x)。plot(abs(X))。axes()。k39。3）“帶通”按鍵的回調(diào)函數(shù)function pushbutton3_Callback(hObject, eventdata, handles)[y,fs,bits]=wavread(39。)。fs=[1000,10000]。rs=40。wp=2*fp/fc。if get(,39。)[N,Wc]=buttord(wp,ws,rp,rs)。 %Wc為雙元素向量，返回2N階帶通濾波器。[num,den]=cheby1(N,rp,Wc)。sound(x,fc,bits)。axes()。axes()。[h,f]=freqz(num,den,256,fc)。plot(f,abs(h),39。)。e:\39。fp=[1000,10000]。rp=。fc=40000。ws=2*fs/fc。value39。[num,den]=butter(N,Wc,39。)。else [N,Wc]=cheb1ord(wp,ws,rp,rs)。stop39。endx=filter(num,den,y)。X=fft(x)。plot(x)。plot(abs(X))。axes()。k39。5）“原始信號”按鍵的回調(diào)函數(shù)function pushbutton5_Callback(hObject, eventdata, handles)[y,fs,bits]=wavread(39。)。Y=fft(y)。plot(y)。plot(abs(Y))。三、調(diào)試分析圖1 控件布局圖2 單擊“激活運行”后界面圖3 巴特沃思高通濾波器圖4 切比雪夫高通濾波器圖5 巴特沃思低通濾波器圖6 切比雪夫低通濾波器 圖7 巴特沃思帶通濾波器 圖8 切比雪夫帶通濾波器 圖9 巴特沃思帶阻濾波器圖10 切比雪夫帶阻濾波器圖3—圖10為巴特沃思和切比雪夫Ⅰ型濾波器在不同頻率特性下產(chǎn)生的信號波形與頻譜，同時有原信號作對比。因為在回調(diào)函數(shù)中，高通和低通、帶通和帶阻濾波器的截止頻率、波紋系數(shù)、抽樣頻率設(shè)定的值是相同的，所以在下圖中縱向?qū)Ρ瓤梢钥闯觯盘柾ㄟ^高通和低通濾波器之后頻譜相對于原信號是互補的，如果對于高通濾波器在某一頻率段上有幅值，那么對于低通濾波器該頻率幅值為零。橫向上對比可以看出不同濾波器選頻特性也不同，特別是在圖7—圖10中選頻邊界處的頻譜處理可以看出，切比雪夫濾波器比巴特沃思濾波器的選頻特性好。在圖3—圖10的波形圖和頻譜圖中可以看出，經(jīng)過濾波器處理后，不僅濾除掉了原信號的部分頻率分量，原信號的幅度也會有所衰減，而低通和帶阻濾波器產(chǎn)生的信號相對于原信號變化不大，是因為設(shè)定的選頻范圍是原信號的頻率段中較集中的部分，所以與此同時，高通和帶通濾波器產(chǎn)生的信號相對于原信號的幅度就會大大衰減，其原因也是在于高通和帶通濾波器的選頻范圍是原信號頻率范圍中較少的一部分。所以根據(jù)各個濾波器的選頻范圍及濾波后信號的音效，可大致判斷原信號的頻率多集中在1000Hz以下。因為濾波器處理的音頻信號是我自己的聲音，所以通過濾波器處理后音頻信號的變化，能大致得出自己聲音的頻率范圍，也是挺有意思的。以前學(xué)MATLAB的時候，最后的大作業(yè)也是用GUI設(shè)計了一個可視化界面，所以在本次設(shè)計中可視化界面的設(shè)計也沒有覺得很難。但最重要的還是感覺到通過課程設(shè)計能夠?qū)W以致用，并且運用以前學(xué)過的工具來更好的理解所學(xué)的內(nèi)容，收獲還是挺大的。此外還要特別感謝指導(dǎo)老師耐心的輔導(dǎo)，并幫助我糾正錯誤，授予以魚，亦之以漁，使我不僅能夠按時完成課程設(shè)計，也從中對本課程有了更深的認(rèn)識與理解，同時也注意到自己在學(xué)習(xí)方法中的不足，并會在日后加以改正。 you don39。 your employer dismisses you and you think that you have been dismissed unfairly.For more information about dismissal and unfair dismissal, seetagainst the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal.Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept it.If you are worried about how the time limits apply to you, take advice from one of the organisations listed underFurther help.If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pensation if you win the case. This is known as at charge you more than 35% of your pensation a damagesbased agreement, you should make sure you39。To find your nearest CAB, including those that give advice by , click onEmployment tribunals.The (lack of) air up there Watch mCayman Islandsbased Webb, the head of Fifa
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