How to read Audio File into Vector?

Hello, I have to read a Audio File (.wav) into a vector.

I know how to plot it:

info = audioinfo('sound.wav');
[y, Fs] = audioread('sound.wav');

t = 0:1/Fs:info.Duration;
t = t(1:end-1);

plot(t,y);
xlabel('Time');
ylabel('Audio Signal');

But this Sript does not read the Audio into a Vector.

I also tried to read every single Sample, but this is to complex and I get error after error. Is there a simple way to do this?

[Cris LaPierre]

It would be helpful if you could share the error messages as well as your sound.wav file.

[dieter alfred]

Sorry, I cannot upload the file, because the forum doesnt accept the .wav filetype. And I have already deleted the code with the error messages. But next time I will upload everything.

Answer 1

[Sugar Daddy]

[y, Fs] = audioread('sound.wav');
sound_duration = length(y)/Fs;
t = 0:1/Fs:sound_duration;
t = t(1:end-1);
%%
soundsc(y,Fs);
%%
plot(t,y);
xlabel('Time');
ylabel('Audio Signal');

[dieter alfred]

Thank you very much for your answer.

[bob bob]

Any idea on how to reduce the # of points? I am trying to get the SVG to use in a graphic design setting so I will be altering the shape more in Illustrator but I would like to reduce the point by quite a bit

[Walter Roberson]

@bob bob

I suggest using resample

If you do not have the Signal Processing Toolbox, then you could instead try using imresize

Answer 2

[Walter Roberson]

An audio file would not be read into a vector in the case where the audio file had multiple channels.

%approach #1
[y, Fs] = audioread('sound.wav');
y = y(:,1);           %take the left channel only
t = (0:length(y)-1)/Fs;

%approach #2
[y, Fs] = audioread('sound.wav');
y = mean(y,2);       %average all channels
t = (0:length(y)-1)/Fs;

Note that the code

t = 0:1/Fs:info.Duration;
t = t(1:end-1);

could result in a time vector that was one element too long or too short because of round-off errors in accumulating the 1/Fs in the colon operation.