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Unrecognized function or variable 'wavread'.

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Nahum Sacay
Nahum Sacay on 21 Aug 2021
Commented: Walter Roberson on 23 Aug 2021
I need help for my school activity my professor given to us, when i try the code there is "Unrecognized function or variable 'wavread'." on the first line of the code.
Here is the code:
[x,fs]=wavread('c:\matlab\work\waed.wav'); %read your waed.wav
xlen=length(x); %calculate the number of samples in the file
a=0.15; %initialize all constants
delay=0.4;
D=delay*fs
y=zerosz(size(x)); % create a matrix, the size of x for efficient an speedier operation
for i=D+1:1:xlen; % filter signal
y(i)=x(1)+a*x(i-D);
end:
sound(y,fs); %play the echo signal
plot(y) %add labels on plot use xlabel and ylabel
f=fft(y) %get the fast fourier transform of soundfile
whos %checks the variables used and the sizes check of out f
plot(abs(f)) %plot magnitude of the fft(frequency content of speech)
plot(abs(f(1:50000))) % plots a section of the fft
  2 Comments
Walter Roberson
Walter Roberson on 23 Aug 2021
Side note: passing a single quoted string into fullfile() will return back exactly the same string. You need to pass in multiple strings to get any useful result. And you made a mistake with comma before the file name
p = fullfile('D:', 'MATLAB', '2021a', 'waed.wav')
would potentially be valid and useful.

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Answers (3)

VBBV
VBBV on 21 Aug 2021
%if 
p = fullfile(path,file);
[Y,Fs] = wavread(p);

Give the path and filename together if in different directory or just filename when in same location as

%if true 
[Y,Fs] = wavread('filename');

Simon Chan
Simon Chan on 21 Aug 2021
It requires Signal Processing Toolbox, type 'ver' in the Command WIndow to check whether you have the right Toolbox or not.
  2 Comments
Walter Roberson
Walter Roberson on 23 Aug 2021
wavread() was removed as of R2015b. When it existed, it was in MATLAB itself, not in the Signal Processing Toolbox (unless it was in Signal Processing in a quite old release.)

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Walter Roberson
Walter Roberson on 23 Aug 2021
wavread() was removed from MATLAB. The replacement code for you is
[x, fs] = audioread('c:\matlab\work\waed.wav'); %read your waed.wav
This does not need any extra toolboxes.

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