課程設(shè)計(jì)-基于matlab的語(yǔ)音信號(hào)的時(shí)、頻域分析設(shè)計(jì)-預(yù)覽頁(yè)
【正文】 機(jī)得到的聲音樣本數(shù)據(jù)就越多，對(duì)聲音波形的表示也越精確。關(guān)鍵詞：MATLAB。本次設(shè)計(jì)介紹了基于MATLAB的對(duì)語(yǔ)音信號(hào)的采集，處理及濾波器的設(shè)計(jì)，并使之實(shí)現(xiàn)的過(guò)程。通俗的講采樣頻率是指計(jì)算機(jī)每秒鐘采集多少個(gè)聲音樣本，是描述聲音文件的音質(zhì)、音調(diào)，衡量聲卡、聲音文件的質(zhì)量標(biāo)準(zhǔn)。信號(hào)的頻譜分析就是計(jì)算信號(hào)的傅立葉變換。IIR數(shù)字濾波器系統(tǒng)函數(shù)：H(z)=（）其中H(z)稱(chēng)為N階IIR數(shù)字濾波器系統(tǒng)函數(shù)。有限脈沖響應(yīng)濾波器在保證幅度特性滿(mǎn)足技術(shù)要求的同時(shí)，很容易做到有嚴(yán)格的線性相位特性。因此，H(z)永遠(yuǎn)穩(wěn)定。IIR數(shù)字濾波器的設(shè)計(jì)方法是利用模擬濾波器成熟的理論及設(shè)計(jì)圖進(jìn)行的，因而保留了一些典型模擬濾波器優(yōu)良的幅度特性。穩(wěn)定和線性相位是FIR濾波器最突出的優(yōu)點(diǎn)。Wavread函數(shù)調(diào)用格式：y=wavread(file),讀取file所規(guī)定的wav文件，返回采樣值放在向量y中。首先畫(huà)出語(yǔ)音信號(hào)的時(shí)域波形，然后對(duì)語(yǔ)音信號(hào)進(jìn)行頻譜分析。title(‘原始信號(hào)波形’)。39。Y=fft(y,N)。原始信號(hào)波形39。)。subplot(2,1,2)。)。ylabel(39。39。 %隨機(jī)函數(shù)產(chǎn)生噪聲Si=y+noise。title(39。時(shí)間39。)。 title(39。時(shí)間39。)。 %過(guò)渡帶寬度M=ceil(*pi/wdelta)。 %因?yàn)樗p不小于50dB，所以選擇海明窗，這里得到海明窗的時(shí)域響應(yīng)b=fir1(N1,wc/pi,win)。 %得到頻率響應(yīng)subplot(3,1,1)。)。 title(39。 plot(w/pi,20*log10(abs(hf)))。 ylabel(39。頻率響應(yīng)39。xlabel(39。相位(degrees)39。)。wp=2*Fp/Ft。p=110.^(rp/20)。dev=[p,s]。plot(w/pi,abs(h))。grid。)。 %語(yǔ)音信號(hào)加入噪聲 nn=0:1:50。xlabel(39。幅度39。)。xlabel(39。幅度39。)。39。 Si=y+noise。m21=fft(z21)。)。xlabel(39。幅度39。plot(abs(m21),39。濾波后信號(hào)頻譜39。)。grid。濾波前信號(hào)波形39。)。grid。濾波后信號(hào)波形39。)。grid。在編寫(xiě)程序的時(shí)候遇到了很多錯(cuò)誤，最后經(jīng)過(guò)查找一些資料和自己的理解都一一糾正了?！稊?shù)字信號(hào)處理》西安，西安電子科技大學(xué)出版社，20082 鄭君里等主編，《信號(hào)與系統(tǒng)》，北京，高等教育出版社。 your employer dismisses you and you think that you have been dismissed unfairly.For more information about dismissal and unfair dismissal, seeagainst 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 undert charge you more than 35% of your pensation To find your nearest CAB, including those that give advice by , click ons 150th anniversary celebrations and will attend City39。for the racist behaviour of their fans durings actions.CSKA said they were surprised and disappointed by Toure39?？傆X(jué)得自己自己似乎應(yīng)該去做點(diǎn)什么，或者寫(xiě)點(diǎn)什么。t really grow up, it seems is not so important。Originally, this world, can produce a chemical reaction to an event, in addition to resolutely, have to do, and time. 原來(lái)，這個(gè)世界上，對(duì)某個(gè)事件能產(chǎn)生化學(xué)反應(yīng)的，除了非做不可的堅(jiān)決，還有，時(shí)間。也曾經(jīng)好像已經(jīng)下定了決心去做某件事，但更多的時(shí)候是最后又打起了退堂鼓。 Those were broken into various shapes of stationery。突然想到那件藍(lán)格子襯衫；那些被折成各種各樣形狀的信紙；那段從街角深巷伊始的友誼；還有那場(chǎng)還沒(méi)有開(kāi)始就宣告了終結(jié)的邂逅計(jì)劃……那些年那些天的非做不可，終于和青春一樣，都將在我們的人生中謝幕。t. Baumgartner still will free fall at a speed that would cause you and me to pass out, and no parachute is guaranteed to work higher than 25,000 feet (7,620 meters).cause there18
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