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ngth(y)。 Noise=*randn(N,1)。 鄭州輕工業(yè)學(xué)院 MATLAB 課程設(shè)計(jì)說明書 11 Si=y+Noise。 %語音信號(hào)加入噪聲 nn=0:1:50。 y=filter(b,1,Si)。 subplot(2,1,1)。 stem(Si)。 xlabel(39。n39。)。 ylabel(39。幅度 39。)。 title(39。濾波前信號(hào)頻譜 39。)。 axis([0 50 2 2])。 subplot(2,1,2)。 stem(out)。 xlabel(39。n39。)。 ylabel(39。幅度 39。)。 title(39。濾波后信號(hào)頻譜 39。)。 axis([0 50 1 1])。 sound(y)。 程序結(jié)果如下圖: 鄭州輕工業(yè)學(xué)院 MATLAB 課程設(shè)計(jì)說明書 12 FIR低通 濾波 程序如下: [y,fs,nbits]=wavread(39。39。)。 N = length (y) 。 noise=*randn(N,1)。 Si=y+noise。 S=fft(Si)。 z21=fftfilt(b21,Si)。 鄭州輕工業(yè)學(xué)院 MATLAB 課程設(shè)計(jì)說明書 13 sound(z21)。 m21=fft(z21)。 subplot(2,2,1)。 plot(abs(S),39。g39。)。 title(39。濾波前信號(hào)的頻譜 39。)。xlabel(39。時(shí)間 39。)。ylabel(39。幅度 39。)。 grid。 subplot(2,2,2)。 plot(abs(m21),39。r39。)。 title(39。濾波后信號(hào)頻譜 39。)。xlabel(39。時(shí)間 39。)。ylabel(39。幅度 39。)。 grid。 subplot(2,2,3)。 plot(S)。 title(39。濾波前信號(hào)波形 39。)。xlabel(39。時(shí)間 39。)。ylabel(39。幅度 39。)。 grid。 subplot(2,2,4)。 plot(z21)。 title(39。濾波后信號(hào)波形 39。)。xlabel(39。時(shí)間 39。)。ylabel(39。幅度 39。)。 grid。 程序結(jié)果如下圖: 鄭州輕工業(yè)學(xué)院 MATLAB 課程設(shè)計(jì)說明書 14 6 心得體會(huì) 通過這次課程設(shè)計(jì),我學(xué)到了很多東西。進(jìn)一步加深了對(duì) MATLAB 的了解。在設(shè)計(jì)的過程中我遇到了不少的問題,比如剛開始要處理的是 WAV 格式的語音信號(hào),可是我發(fā)現(xiàn)不是所有的 WAV 文件都可以用 WAVREAD 函數(shù)讀取,通過軟件轉(zhuǎn)化了才可以使用。在 編寫程序的時(shí)候遇到了很多錯(cuò)誤,最后經(jīng)過查找一些資料和自己的理解都一一糾正了??偟膩碚f,通過這次的課程設(shè)計(jì)我對(duì)語音信號(hào)有的更多的認(rèn)識(shí),對(duì)數(shù)字信號(hào)處理的知識(shí)有了更多的理解,鍛煉了我的理論與實(shí)際相結(jié)合的能力,并且熟練的應(yīng)用 MATLAB 也加深了我對(duì)課程的理解。這次設(shè)計(jì)使我更深刻的了解 MATLAB 的使用方法,同時(shí)我相信,進(jìn)一步加強(qiáng)對(duì) MATLAB 的學(xué)習(xí)對(duì)我今后的學(xué)習(xí)將會(huì)起到很大的幫助。 鄭州輕工業(yè)學(xué)院 MATLAB 課程設(shè)計(jì)說明書 15 7 參考文獻(xiàn): 1 高西全,丁玉美編著?!稊?shù)字信號(hào)處理》西安,西安電子科技大學(xué)出版社,2021 2 鄭君里等主編,《信號(hào)與系統(tǒng)》,北京,高 等教育出版社。 2021 3 陳懷琛等編著,《 MATLAB 及在電子信息課中的應(yīng)用》,北京,電子工業(yè)出版社, 2021 g an employment tribunal claim Employment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: ? you don39。t agree with the disciplinary action your employer has taken against you ? your employer dismisses you and you think that you have been dismissed unfairly. For more information about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。t appealed against 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 anisations listed under Further help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further 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 a damagesbased agreement. In England and Wales, your solicitor can39。t charge