A Frequency Domain view of Upsampling
By: Michael Deufel
1. Introduction
2. Derivation
3. Examples
4. Conclusion
1. Introduction
The purpose of Upsampling is to manipulate a signal in order to increase the sampling rate.
This is done by taking the signal padding with zeros, then taking the DTFT and sending it through a LPF (low pass filter) and then taking the inverse DTFT to return to the time domain.
We will overview the whole process but focus on the effect upsampling has in the frequency domain
