Sequence expansion by zeros and interpolation - does it insert additional frequencies?

1. What is the effect of zero padding in frequency domain?
2. Does upsampling increase bandwidth?
3. What is the effect of upsampling in the frequency domain?
4. What is frequency interpolation?

What is the effect of zero padding in frequency domain?

In this case, we can say “zero padding in the frequency domain results in an increased sampling rate in the time domain”.

Does upsampling increase bandwidth?

upsampling increases the *available* bandwidth, but does not in itself, create new information to fill that new available bandwidth. so proper upsampling will have some empty spectrum resulting (improper upsampling will have images but those images are not new information).

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 frequency interpolation?

Interpolation is the process of increasing the sampling frequency of a signal to a higher sampling frequency that differs from the original frequency by an integer value. Interpolation also is known as up-sampling.