Question

Hello, I have questions on Matlab. Let's say that I have an equation. Signal x(t)= cos(2*pi*10*t) is sampled at sampling frequency of Fs=100 Hz. How do I both Upsample and downsample this frequency by a factor of 2 in Matlab? I need to see the code and how the graphs look. Thank you for the help.

Answer 1

Note: Done accordingly. Please comment for any problem. Please Uprate. Thanks

In matlab we have :

upsample

Increase sample rate by integer factor

downsample

Decrease sample rate by integer factor

Code:

Fs = 100;
t = 0:1/Fs:1-1/Fs;
x = cos(2*pi*10*t);
y = upsample(x,2);
y2= downsample(x,2);
subplot(3,1,1)
stem(t(1:50),x(1:50),'filled','markersize',3)
grid on
xlabel 'Sample number',ylabel Original
subplot(3,1,2)
stem(t(1:50),y(1:50),'filled','markersize',3)
grid on
xlabel 'Sample number',ylabel UpSample
subplot(3,1,3)
stem(t(1:50),y2(1:50),'filled','markersize',3)
grid on
xlabel 'Sample number',ylabel DownSample