How do I trim a WAV file from point A to B.

I am looking into trimming a WAV file to section out a beep sound. The clip is 47 seconds long and was converted from an AAC file. Here is what I am needing for this script.

-Retrieve file

-Use point A and B with different inputs of seconds (ex. A=37 seconds and B =39 seconds, or A=37.5 and B=38.5)

-Send file out in WAV

I can retrive the file and send a new one out just fine. The new thing I would like to learn about is trimming audio clips. How should I do this?

Any script help and code reffeences would be awesome.

Answer 1

[Daniel M]

You have the sampling frequency as an output from the audioread function. The time vector would typically go

t = 0:1/fs:(length(soundfile)-1)/fs;

So then, 37 seconds will occur at roughly (37*fs + 1) in t. But this won't always work. Safer is to search for the closest value in your t variable.

[~,loc37] = min(abs(t-37));
[~,loc39] = min(abs(t-39));

x(loc37:loc39) = []; % this will cut out the sections of your sound file between 37 and 39 seconds