Creating the discrete-time graph of a recorded audio signal

Hello!

I am a second year engineering major. I have not yet studied anything that remotely resembles MATLAB but as an exercise i have been given the task of displaying a given audio signal in a discrete-time graph and after that finding its fourier transform. The problem is that all that should be done in MATLAB. I have the audio signal as a recording. The exercise requires that i display the first 80 samples with the sampling rate being up to me.

From what i could gather i created this, but unfortunately it doesn't work and to be honest I don't really understand what I am doing. Can someone offer a little help?

Thanks in advance!

Fs = 4000; Channels = 1; bits = 16;
[data, fs] = audioread("/MATLAB Drive/recordingX.wav");
X = getaudiodata(data);
n = 0:1/Fs:(length(X)-1)/Fs;
plot(n,X);

Answer 1

[Mathieu NOE]

hello

no panic !

if you have records in wav format , you only need audioread to get your data

getaudiodata is not needed here (read the doc if you have time though)

as a wav file can have one or multiple channes , also look at the end how you can either plot one channel or all channels on the same graph

hope it helps !

Fs = 4000; Channels = 1; bits = 16;
[data, fs] = audioread("/MATLAB Drive/recordingX.wav");
[samples,channels] = size(data);

% plot the k first samples 
k = 80;
n = 1:k;
% plot(n,data(n,:)); % will plot all channels 
plot(n,data(n,1)); % will plot first channel

[Bill]

Thanks a lot for your time and effort! Please keep helping other people

[Mathieu NOE]

My pleasure !