Unrecognized function or variable 'wavread'.

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

[Nahum Sacay]

there is still unrecognized on the program

>> p = fullfile('D:\MATLAB\2021a,waed.wav');

>> [Y,Fs]=wavread(p);

Unrecognized function or variable 'wavread'.

[Walter Roberson]

As I posted in https://www.mathworks.com/matlabcentral/answers/1437839-unrecognized-function-or-variable-wavread#answer_772544 and https://www.mathworks.com/matlabcentral/answers/1437839-unrecognized-function-or-variable-wavread#comment_1701029 : wavread() has been removed from MATLAB. The last release that had wavread() was R2015a.

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.

Answer 1

[Simon Chan]

It requires Signal Processing Toolbox, type 'ver' in the Command WIndow to check whether you have the right Toolbox or not.

[Nahum Sacay]

Thank you,I checked it and there is no Signal Processing Toolbox.

[Walter Roberson]

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.)

Answer 2

[Walter Roberson]

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.