基于matlab的码型转换

利用Matlab软件的GUI界面编程，做一个简单的界面，通过此界面调用相关的程序去实现由抽样判决后的AMI码型、CMI码型和HDB3码型数字序列恢复出原始的PCM脉冲编码信号。

实验目的：1,熟悉Matlab的GUI的编程操作，学会运用GUI来建立一个界面2.掌握AMI,CMI,HDB3码型的特点和意义，学会将PCM脉冲编码信号转化为AMI,CMI,HDB3的编码以及AMI,CMI,HDB3解码的方式。

实验方法：实验中采用的方法是先建立大概的界面，其中包括输入框、按钮、提示内容及坐标系等。

然后再对各种组件设置好属性，并对各个组件编写回调函数，最后进行调试验证饥渴。

实验代码：1.AMI码型转换：%%%%%%%%%%%% 编码 %%%%%%%%%%%%%p = -1;for i=1:length(f);if f(i)==1e(i) = (-1)*p;p = e(i);elsee(i) = f(i);endend%%%%%%%%%%%% 译码 %%%%%%%%%%%%for i=1:length(f);if e(i)~=0l(i) = 1;elsee(i) = 0;endend编码：代码中的f代表着输入字符串转化后的ASCII码，用变量p来实现原信号中1的正负交替。

例如，f（1）=1，则e（1）=1，p=1；f（2）=1，则e（2）=-1，p=-1。

如此就可以得到正负1交替了。

译码：当e（i）不等于0，就把结果等于1。

2.CMI码型转换%%%%%%%%%%%% 编码 %%%%%%%%%%%%%m=1;p=-1;for i=1:length(f)if(f(i)==1&m==1)s(i)=3;m=m*p;else if(f(i)==1&m==-1)s(i)=0;m=m*p;elses(i)=1;endendendk=dec2bin(s,2);l=k';x=l(:);y=x';n=str2num(y(1));for i=2:length(y)n=[n str2num(y(i))];end%%%%%%%%%%%% 译码 %%%%%%%%%%%%%if n(1)==0if n(2)==1cm=[0];elsecm=[1];endelsecm=[1];endr=3;while r<length(n)if n(r)==0if n(r+1)==1cm=[cm 0];elsecm=[cm 1];endelsecm=[cm 1];endr=r+2;end3.HDB3码型转换%%%%%%%%%%%% 编码 %%%%%%%%%%%%%yn=xn;% 输出yn初始化num=0;% 计数器初始化for k=1:length(xn)if xn(k)==1num=num+1; % "1"计数器if num/2 == fix(num/2) % 奇数个1时输出-1,进行极性交替yn(k)=1;elseyn(k)=-1;endendend% HDB3编码num=0; % 连零计数器初始化yh=yn; % 输出初始化sign=0; % 极性标志初始化为0V=zeros(1,length(yn));% V脉冲位置记录变量B=zeros(1,length(yn));% B脉冲位置记录变量for k=1:length(yn)if yn(k)==0num=num+1; % 连“0”个数计数if num==4 % 如果4连“0”num=0; % 计数器清零yh(k)=1*yh(k-4);% 让0000的最后一个0改变为与前一个非零符号相同极性的符号V(k)=yh(k); % V脉冲位置记录if yh(k)==sign % 如果当前V符号与前一个V符号的极性相同 yh(k)=-1*yh(k); % 则让当前V符号极性反转,以满足V符号间相互极性反转要求yh(k-3)=yh(k); % 添加B符号,与V符号同极性B(k-3)=yh(k); % B脉冲位置记录V(k)=yh(k); % V脉冲位置记录yh(k+1:length(yn))=-1*yh(k+1:length(yn));% 并让后面的非零符号从V符号开始再交替变化endsign=yh(k); % 记录前一个V符号的极性endelsenum=0; % 当前输入为“1”则连“0”计数器清零endend%%%%%%%%%%%% 译码 %%%%%%%%%%%%%input=yh; % HDB3码输入decode=input; % 输出初始化sign=0; % 极性标志初始化for k=1:length(yh)if input(k) ~= 0if sign==yh(k) % 如果当前码与前一个非零码的极性相同decode(k-3:k)=[0 0 0 0];% 则该码判为V码并将*00V清零endsign=input(k); % 极性标志endenddecode=abs(decode); % 整流实验现象：总体界面：AMI：CMI：HDB3：总结：1.本次实验中因为对画方波不太熟悉，在使用stairs函数时，方波图总是在最后少了一位，后来经查询后才知道stairs的正确用法。

2.由于对GUI界面设置的不熟悉，很多细节都没做到位，界面的美观有待提高。

3.在编代码是经常没有写注释，导致后来有些变量混淆了。

附录：全部代码function varargout = untitled1(varargin)% UNTITLED1 M-file for% UNTITLED1, by itself, creates a new UNTITLED1 or raises the existing% singleton*.%% H = UNTITLED1 returns the handle to a new UNTITLED1 or the handle to% the existing singleton*.%% UNTITLED1('CALLBACK',hObject,eventData,handles,...) calls the local% function named CALLBACK in with the given input arguments.%% UNTITLED1('Property','Value',...) creates a new UNTITLED1 or raises the% existing singleton*. Starting from the left, property value pairs are% applied to the GUI before untitled1_OpeningFunction gets called. An% unrecognized property name or invalid value makes property application% stop. All inputs are passed to untitled1_OpeningFcn via varargin. %% *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one % instance to run (singleton)".%% See also: GUIDE, GUIDATA, GUIHANDLES% Edit the above text to modify the response to help untitled1% Last Modified by GUIDE 21-Dec-2014 19:55:20% Begin initialization code - DO NOT EDITgui_Singleton = 1;gui_State = struct('gui_Name', mfilename, ...'gui_Singleton', gui_Singleton, ...'gui_OpeningFcn', @untitled1_OpeningFcn, ...'gui_OutputFcn', @untitled1_OutputFcn, ...'gui_LayoutFcn', [] , ...'gui_Callback', []);if nargin && ischar(varargin{1})= str2func(varargin{1});endif nargout[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});elsegui_mainfcn(gui_State, varargin{:});end% End initialization code - DO NOT EDIT% --- Executes just before untitled1 is made visible.function untitled1_OpeningFcn(hObject, eventdata, handles, varargin)% This function has no output args, see OutputFcn.% hObject handle to figure% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% varargin command line arguments to untitled1 (see VARARGIN)% Choose default command line output for untitled1= hObject;% Update handles structureguidata(hObject, handles);% UIWAIT makes untitled1 wait for user response (see UIRESUME)% uiwait;% --- Outputs from this function are returned to the command line.function varargout = untitled1_OutputFcn(hObject, eventdata, handles)% varargout cell array for returning output args (see VARARGOUT);% hObject handle to figure% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% Get default command line output from handles structurevarargout{1} = ;function edit_Callback(hObject, eventdata, handles)% hObject handle to edit (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% Hints: get(hObject,'String') returns contents of edit as text% str2double(get(hObject,'String')) returns contents of edit as a double% --- Executes during object creation, after setting all properties.function edit_CreateFcn(hObject, eventdata, handles)% hObject handle to edit (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles empty - handles not created until after all CreateFcns called% Hint: edit controls usually have a white background on Windows.% See ISPC and COMPUTER.if ispc && isequal(get(hObject,'BackgroundColor'),get(0,'defaultUicontrolBackgroundColor'))set(hObject,'BackgroundColor','white');end% --- Executes on button press in ami.function ami_Callback(hObject, eventdata, handles)user_string=get,'string');a=dec2bin(user_string,8);b=a';c=b(:);d=c';f=str2num(d(1));for i=2:length(d)f=[f str2num(d(i))];endf=[f 0];%%%%%%%%%%%% ±àÂë %%%%%%%%%%%%% p = -1;for i=1:length(f);if f(i)==1e(i) = (-1)*p;p = e(i);elsee(i) = f(i);endend%%%%%%%%%%%% ÒëÂë %%%%%%%%%%%% for i=1:length(f);if e(i)~=0l(i) = 1;elsee(i) = 0;endendaxest=1:length(f);stairs(t-1,f)axis([0 length(f) -2 2])xlabel('ASCIIÂë');grid minor;axest=1:length(e);stairs(t-1,e)axis([0 length(e) -2 2])xlabel('AMI ±àÂë');grid minor;axest=1:length(l);stairs(t-1,l)axis([0 length(l) -2 2])xlabel('AMI ÒëÂë');grid minor;% hObject handle to ami (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)% --- Executes on button press in cmi.function cmi_Callback(hObject, eventdata, handles)user_string=get,'string');a=dec2bin(user_string,8);b=a';c=b(:);d=c';f=str2num(d(1));for i=2:length(d)f=[f str2num(d(i))];endf=[f 0];%%%%%%%%%%%% ±àÂë %%%%%%%%%%%%%m=1;p=-1;for i=1:length(f)if(f(i)==1&m==1)s(i)=3;m=m*p;else if(f(i)==1&m==-1)s(i)=0;m=m*p;elses(i)=1;endendendk=dec2bin(s,2);l=k';x=l(:);y=x';n=str2num(y(1));for i=2:length(y)n=[n str2num(y(i))];end%%%%%%%%%%%% ÒëÂë %%%%%%%%%%%%%if n(1)==0if n(2)==1cm=[0];elsecm=[1];endelsecm=[1];endr=3;while r<length(n)if n(r)==0if n(r+1)==1cm=[cm 0];elsecm=[cm 1];endelsecm=[cm 1];endr=r+2;endaxest=1:length(f);stairs(t-1,f)axis([0 length(f) -2 2])xlabel('ASCIIÂë');grid minor;axest=1:length(n);stairs(t-1,n)axis([0 length(n) -2 2])xlabel('CMI ±àÂë');grid minor;axest=1:length(cm);stairs(t-1,cm)axis([0 length(cm) -2 2])xlabel('CMI ÒëÂë');grid minor;% hObject handle to cmi (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)% --- Executes on button press in hdb3.function hdb3_Callback(hObject, eventdata, handles)user_string=get,'string');a=dec2bin(user_string,8);b=a';b=a';c=b(:);d=c';xn=str2num(d(1));for i=2:length(d)xn=[xn str2num(d(i))];endxn=[xn 0];%%%%%%%%%%%% ±àÂë %%%%%%%%%%%%%yn=xn;% Êä³öyn³õʼ»¯num=0;% ¼ÆÊýÆ÷³õʼ»¯for k=1:length(xn)if xn(k)==1num=num+1; % "1"¼ÆÊýÆ÷if num/2 == fix(num/2) % ÆæÊý¸ö1ʱÊä³ö-1,½øÐм«ÐÔ½»Ìæyn(k)=1;elseyn(k)=-1;endendend% HDB3±àÂënum=0; % Á¬Áã¼ÆÊýÆ÷³õʼ»¯yh=yn; % Êä³ö³õʼ»¯sign=0; % ¼«ÐÔ±êÖ¾³õʼ»¯Îª0V=zeros(1,length(yn));% VÂö³åλÖüǼ±äÁ¿B=zeros(1,length(yn));% BÂö³åλÖüǼ±äÁ¿for k=1:length(yn)if yn(k)==0num=num+1; % Á¬¡°0¡±¸öÊý¼ÆÊýif num==4 % Èç¹û4Á¬¡°0¡±num=0; % ¼ÆÊýÆ÷ÇåÁãyh(k)=1*yh(k-4);%ÈÃ0000µÄ×îºóÒ»¸ö0¸Ä±äΪÓëÇ°Ò»¸ö·ÇÁã·ûºÅÏàͬ¼«ÐԵķûºÅV(k)=yh(k); % VÂö³åλÖüǼif yh(k)==sign %Èç¹ûµ±Ç°V·ûºÅÓëÇ°Ò»¸öV·ûºÅµÄ¼«ÐÔÏàͬyh(k)=-1*yh(k); %ÔòÈõ±Ç°V·ûºÅ¼«ÐÔ·´×ª,ÒÔÂú×ãV·ûºÅ¼äÏ໥¼«ÐÔ·´×ªÒªÇóyh(k-3)=yh(k); % Ìí¼ÓB·ûºÅ,ÓëV·ûºÅͬ¼«ÐÔB(k-3)=yh(k); % BÂö³åλÖüǼV(k)=yh(k); % VÂö³åλÖüǼyh(k+1:length(yn))=-1*yh(k+1:length(yn));%²¢ÈúóÃæµÄ·ÇÁã·ûºÅ´ÓV·ûºÅ¿ªÊ¼ÔÙ½»Ìæ±ä»¯endsign=yh(k); % ¼Ç¼ǰһ¸öV·ûºÅµÄ¼«ÐÔendelsenum=0; %µ±Ç°ÊäÈëΪ¡°1¡±ÔòÁ¬¡°0¡±¼ÆÊýÆ÷ÇåÁãendend%%%%%%%%%%%% ÒëÂë %%%%%%%%%%%%%input=yh; % HDB3ÂëÊäÈëdecode=input; % Êä³ö³õʼ»¯sign=0; % ¼«ÐÔ±êÖ¾³õʼ»¯for k=1:length(yh)if input(k) ~= 0if sign==yh(k) %Èç¹ûµ±Ç°ÂëÓëÇ°Ò»¸ö·ÇÁãÂëµÄ¼«ÐÔÏàͬdecode(k-3:k)=[0 0 0 0];% Ôò¸ÃÂëÅÐΪVÂë²¢½«*00VÇåÁãendsign=input(k); % ¼«ÐÔ±êÖ¾endenddecode=abs(decode); % ÕûÁ÷axest=1:length(xn);stairs(t-1,xn)axis([0 length(xn) -2 2])xlabel('ASCIIÂë');grid minor;axest=1:length(yh);stairs(t-1,yh)axis([0 length(yh) -2 2])xlabel('HDB3 ±àÂë');grid minor;axest=1:length(decode);stairs(t-1,decode)axis([0 length(decode) -2 2])xlabel('HDB3 ÒëÂë');grid minor;% hObject handle to hdb3 (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% --- Executes when plent is resized.function plent_ResizeFcn(hObject, eventdata, handles)% hObject handle to plent (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% --------------------------------------------------------------------function plent_ButtonDownFcn(hObject, eventdata, handles)% hObject handle to plent (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles structure with handles and user data (see GUIDATA)% --- Executes during object creation, after setting all properties. function plent_CreateFcn(hObject, eventdata, handles)% hObject handle to plent (see GCBO)% eventdata reserved - to be defined in a future version of MATLAB% handles empty - handles not created until after all CreateFcns called。