Abstract
Convolution is a time-domain technique for determining the output of a system in response to any general input. The approach is based on the system's impulse response; the impulse response is used as a representation of the system's response to an infinitesimal segment of the input. If the system is linear and superposition holds, the impulse response from each input segment can be summed to produce the system's output. The convolution integral is basically a running correlation between the input signal and the impulse response. This integration can be cumbersome for complicated input signals or impulse responses, but is easy to program on a computer.
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