Impulse response of non-causal system

1. What is the impulse response of a causal system?
2. What is non causal system with example?
3. What is the difference between causal non causal and anti causal system?
4. What are non causal systems?

What is the impulse response of a causal system?

For a causal system, the impulse response of the system must use only the present and past values of the input to determine the output. This requirement is a necessary and sufficient condition for a system to be causal, regardless of linearity. Note that similar rules apply to either discrete or continuous cases.

What is non causal system with example?

The non-causal systems can generate an output before the input is given, hence they are also known as anticipative systems. The non-causal systems do not exist in real time. Also, these systems are not physically realisable. The image processing systems are the examples of noncausal systems.

What is the difference between causal non causal and anti causal system?

A causal system is one whose output depends only on the present and the past inputs. A noncausal system's output depends on the future inputs. In a sense, a noncausal system is just the opposite of one that has memory. How can a real-world system be noncausal?

What are non causal systems?

A non-causal system is just opposite to that of causal system. If a system depends upon the future values of the input at any instant of the time then the system is said to be non-causal system.