Upsampling with en emphasis on the frequency domain
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:
Step 1: Descretise the signal
Step 1: Pad original signal with zeros
Step 2: Taking the DTFT
Step 3: Sending through a LPF (low pass filter)
Step 4: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
