Representing samples on analog signal according to the sample period (MATLAB)

Dear,

I have this analog signal y from this code:

load handel.mat
filename = 'handel.wav';
audiowrite(filename,y,Fs);
[y,Fe]=audioread('handel.wav');
[N,p]=size(y);
Te=1/Fe;
t=(0:N-1)*Te;
plot(t,y)

Te here is 1.22e-04 in xlabel

The purpose is to represent a sample on the plot according to each value of Te. It means we represent the first sample in Te=1.22e-04 than the second sample in Te=(1.22e-04)*2 ...etc.

How can I do that please!

[Voss]

Maybe stem will work for what you want to do:

https://www.mathworks.com/help/matlab/ref/stem.html

Answer 1

[Star Strider]

The easiest way to create the time vector is:

t = linspace(0, L-1, L)/Fe;

Example —

LD = load('handel.mat');
y = LD.y;
Fe = LD.Fs;

L = size(y,1);
t = linspace(0, L-1, L)/Fe;

figure
plot(t, y)
grid
xlabel('Time (sec)')
ylabel('Amplitude (mV)')
xlim([min(t) max(t)])

Create whatever sort of plot you need to in order to complete your assignment.

.

[high speed]

@Star Strider But this program doesn't represent the samples in the figure !

[Star Strider]

Yes, it does!

What do you want to do with that file?

Consider this —

LD = load('handel.mat');
y = LD.y;
Fe = LD.Fs;

L = size(y,1);
t = linspace(0, L-1, L)/Fe;

figure
stairs(t, y)
grid
xlabel('Time (sec)')
ylabel('Amplitude (mV)')
xlim([2.74 2.76])
ylim([-1 1]*0.8)

% xlim([min(t) max(t)])

Create whatever sort of plot you need to in order to complete your assignment.

.