【数字信号调制】基于PCM实现信号编码调制含Matlab源码

1 简介

所谓的PCM(pulse code modulation)编码指的是把模拟电视(视频或音频)信号,通过取样(时间上离散化)、量化(幅度上离散化)处理后变换成在时间、幅度上均离散化的信号,再用二进制数码表示的脉冲编码调制信号(PCM),如图1所示.

2 部分代码

function varargout = PCM(varargin)% PCM M-file for PCM.fig%      PCM was designed in order to show how PCM works%%      To simplify the undesrtanding of this method, the program first takes%      a sine wave. Then you can choose a sampling scheme, and you can see%      the output of the sampler. You can choose one out of three sampling %      methods.%      If you choose natural sampling; then you will have the chance to modify%      the sampling window, and see the effects of this change in the output of%      the sampler.%%      Once you got the sampled signal you can quantize it by a method that is %      known as two rules and an alorithm.%      The option Squeezing and Stretching shows the best G(x) tha minimizes %      the MSE. You can better understand this using the book%      Telecommunications Demystified written by Carl Nassar. You can find%      information about this on Chapter four of that book. %      You can edit the bit's number and the number of iterations of the%      algorithm. The bigger the number of bits, the smaller the MSE.%      The picture shows the signal after quantization, the first iteration%      in the quantization process and the output of the quantizer%      %      Then, by pressing the Bit Stream button you will see the PCM output%      of the signal that you have selected in the input area.%      ​​​​% --------------------------------------------------------------------function Untitled_1_Callback(hObject, eventdata, handles)% hObject    handle to Untitled_1 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)helpdlg('In order to understand this program in a deeper way, it is desirable to have the book Telecommunications Demystified of Carl Nassar, it is possible to have an electronic version of the book. You can work with the chapter four of the book.', 'Recomendations');​​% --------------------------------------------------------------------function Untitled_2_Callback(hObject, eventdata, handles)% hObject    handle to Untitled_2 (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 pushbutton7.function pushbutton7_Callback(hObject, eventdata, handles)% hObject    handle to pushbutton7 (see GCBO)% eventdata  reserved - to be defined in a future version of MATLAB% handles    structure with handles and user data (see GUIDATA)​

3 仿真结果

4 参考文献

[1]郭慧. 基于PCM编码的模拟信号数字化实现[J]. 微型机与应用, 2017, 36(2):3.

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