Causality forces real systems to lack knowledge of future input
Evidence
The impulse responses h(t) or h(n) for a real-time system are always causal; that is, h(·) = 0 when t or n < 0. This means that a physically realizable system does not have information on the future values of its input signal. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 357
Categorization
Category: Definitional Content
- DEFINE: Binds the mathematical notion of causality in impulse responses to the physical constraint that systems cannot anticipate future inputs.
Related
- Physically realizable systems cannot respond to future input values (similarity 0.93)
- Hegemony does not turn definer inputs into predictable outputs (similarity 0.82)
- Known excitation signals sidestep the need for physically impossible impulses (similarity 0.82)