Impulse invariance

Impulse invariance is a technique used in digital signal processing (DSP) to convert an analog filter into a digital filter while preserving the impulse response characteristics of the original filter. The primary purpose of impulse invariance is to ensure that the digital filter's impulse response is a discretized version of the continuous-time filter's impulse response. ### Key Concepts: 1. **Impulse Response**: The impulse response of a system is its output when the input is an impulse signal (a Dirac delta function).