The effect of upsampling on DFT coefficients

1. What is the effect of upsampling in the frequency domain?
2. What is the purpose of upsampling?
3. Can upsampling cause aliasing?
4. What is upsampling in signal processing?

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.

What is the purpose of upsampling?

The purpose of Upsampling is to manipulate a signal in order to artificially increase the sampling rate.

Can upsampling cause aliasing?

It means creation of frequency components above 1/2 sampling rate of the original signal. Sometimes it is also considered to be a form of aliasing. When you are upsampling by a non-integer ratio (e.g. from 44.1 to 96 kHz), you get both imaging above 1/2 sampling rate of the original signal and aliasing below that rate.

What is upsampling in signal processing?

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.