Howtosignalprocessing
A system is said to be causal if it does not respond before the input is applied. In other words, in a causal system, the output at any time depends only on the values of the input signal up to and including that time and does not depend on the future values of the input.
- What is a causal system give an example?
- How do you know if a LTI system is causal?
- What is causality in DSP?
What is a causal system give an example?
A system is said to be causal if its output depends upon present and past inputs, and does not depend upon future input. For non causal system, the output depends upon future inputs also. Example : y(n) = 2 x(t) + 3 x(t-3) For present value t=1, the system output is y(1) = 2x(1) + 3x(-2).
How do you know if a LTI system is causal?
An LTI system is called causal if the output signal value at any time t depends only on input signal values for times less than t. It is easy to see from the convolution integral that if h(t) = 0 for t < 0, then the system is causal.
What is causality in DSP?
Causality means that the output of the system does not depend on future inputs, but only on past input. In particular, this means that if the input signal is zero for all $t or a predictable and input-independent signal for very fancy systems.
