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i want to find and hear the frequency responce of a .wav file using following equation y(n)=y(n-1)-0.9*y(n-2)+x(n)+x(n-1) but still its giving error in equation foolowing is my code

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lione felus 2015-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/231050-i-want-to-find-and-hear-the-frequency-responce-of-a-wav-file-using-following-equation-y-n-y-n-1

评论： Walter Roberson 2015-7-24

采纳的回答： Walter Roberson

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the main error is due to the equation please help me to figure it out .following is the code and error

PathOriginal = fullfile('C:\Users\Desktop\assigmnt', 'Voice 002.wav'); [y, Fs, n] = wavread(PathOriginal);
b=[1 1]; a=[1 -1 0.9];
y(n)= y(n-1)-0.9*y(n-2)+x(n)+x(n-1) [H,w]=freqz(b,a,n,Fs) player=audioplayer(y, Fs) play(player)
player2=audioplayer(H, w, Fs) play(player2)
   error : ??? Error: File: q2.m Line: 7 Column: 12
  Unexpected MATLAB operator.

this error appears in equation's line .

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Walter Roberson 2015-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/231050-i-want-to-find-and-hear-the-frequency-responce-of-a-wav-file-using-following-equation-y-n-y-n-1#answer_187096

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You need to use semi-colons to separate multiple commands in the same line. For example

player2=audioplayer(H, w, Fs) play(player2)

is not valid and needs to be

player2=audioplayer(H, w, Fs); play(player2)

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lione felus 2015-7-24

编辑：lione felus 2015-7-24

q2.m

thanks walter but its actually giving error in the line where equation is written . here is my m file

Walter Roberson 2015-7-24

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The line in question is

y(n)= y(n-1?)-0.9*y(n-?2)+x(?n-1)+x(n)

You should delete the line and retype it.

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