How to use envelope function in Matlab?

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Tayyab Shinwari 2018-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/379555-how-to-use-envelope-function-in-matlab

回答： Sambit Behura 2018-1-30

The following Matlab code generate a sound but it contain tak tak like sound which can be easily heard.Can someone removes this noise by using envelope function.

Fs=44100;
T=1/Fs;
M=zeros(1,88);
for I=7:88
  M(I)=round(36.8*(2^(1/12))^(I-6));
  end
  signal=[];
  FrTm=[50,3;50,3;52,3;54,3;50,3;54,3;52,3;45,3;50,3;50,3;52,3;54,3;50,6;
  49,3;1,3;50,3;50,3;52,3;54,3;55,3;54,3;52,3;50,3;49,3;45,3;47,3;49,3;50,6;
  50,3;1,3;47,5;49,1;47,3;45,3;47,3;49,3;50,3;1,3;45,5;47,1;45,3;43,3;42,6;
  45,3;1,3;47,5;49,1;47,3;45,3;47,3;49,3;50,3;47,3;45,3;50,3;49,3;52,3;50,6;
  50,6];
  for i=1:length(FrTm)
    x=FrTm(i,1);
    y=FrTm(i,2);
    F=M(x);
    time=0:1/Fs:y/18;
    sinewave=*sin(2*pi*10*F*time);
      signal=[signal sinewave];
     end
     stem(signal)
     sound(signal,Fs)

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Tayyab Shinwari 2018-1-30

sorry there is no* before sinewave just multiply 2 amplitude it resolve even if you add pi to start it completly remove it

Jan 2018-1-30

Sorry, there is a * before the sin command. I can see it. If it is a typo, please edit the question instead of leaving this confusing crashing line for the readers. Thanks.

I do not understand the rest of the comment: "just multiply 2 amplitude it resolve even if you add pi to start it completly remove it". What does this mean?

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