How to reconstruct a signal from it's downsample values?

I have a sinusoidal singal (e.g.- ). The frequency is 50 Hz. I downsampled the singal where there are 32 samples/cycle. But now need to get the original signal from the downsampled values. How can I do that?

Answer 1

[Pratyush]

Hi Ananta. It is my understanding that you have a downsampled sinusoidal signal and you would like to obtain the original signal. It can be achieved through upsampling. The video resource below describes upsampling of a sinusoidal signal in MATLAB and its plotting. Hope this helps.

Upsampling and Plotting a Signal in Matlab - YouTube