Upsample data using FFTs. How is this exactly done?

1. How is upsampling done?
2. Why is upsampling done?
3. What is the effect of upsampling in the frequency domain?
4. Why do we Upsample a signal?

How is upsampling done?

Upsampling is the process of inserting zero-valued samples between original samples to increase the sampling rate. (This is sometimes called “zero-stuffing”.) This kind of upsampling adds undesired spectral images to the original signal, which are centered on multiples of the original sampling rate.

Why is upsampling done?

The purpose of Upsampling is to manipulate a signal in order to artificially increase the sampling rate. This is done by... Upsampling is an effective way to reduce time between samples of a signal without resampling the original signal.

What is the effect of upsampling in the frequency domain?

Upsampling adds to the original signal undesired spectral images which are centered on multiples of the original sampling rate. In Frequency domain , Upsampling means the padding of zeros at the last of max frequency components on all sides of the signal.

Why do we Upsample a signal?

The purpose of upsampling is to add samples to a signal, whilst maintaining its length with respect to time. Consider again a time signal of 10 seconds length with a sample rate of 1024Hz or samples per second that will have 10 x 1024 or 10240 samples.