Complex impulse response functions?

1. Can impulse response be complex?
2. What is the function of impulse response?
3. What are the different types of impulse response functions?
4. What is complex frequency response function?

Can impulse response be complex?

An entirely real time domain impulse function (and signal) can be complex in the frequency domain. Then, because of causality, the real and complex components of the impulse response are themselves related to each other.

What is the function of impulse response?

In signal processing, the impulse response, or impulse response function (IRF), of a dynamic system is its output when presented with a brief input signal, called an impulse. More generally, an impulse response refers to the reaction of any dynamic system in response to some external change.

What are the different types of impulse response functions?

The impulse response is a function of time and can be described as instantaneous, causal, anticausal, or acausal (Fig. 2).

What is complex frequency response function?

The complex frequency response function of a system represents the complex relation between two signals (result curves from a time range).