Impulse response

An impulse response describes how a system reacts to a sudden, brief input—like a quick tap or beep. It reveals the system's characteristics, showing how it processes and returns to normal over time. For example, in audio, it helps us understand how a space echoes sound. In engineering, it shows how instruments or circuits respond to sudden signals. Think of it as a fingerprint of the system's behavior, capturing its unique way of reacting to a brief disturbance.