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Answer Posted / wattoo
Impulse response is the response of a system to a unit impulse at its input.
Any signal can be considered(approximated) as a stream of impulses (These impulses will be immeasurably close to each other in continuous signals, and will be 1 sample apart for discrete signals). These are not unit impulses. (they have magnitude not necessarily 1). So the response of the system to this impulse should be a scaled form of 'unit impulse response'.
So the output of the system for a certain signal can be considered as the superposition of impulse response due to all the impulses in the input signal. This process of scaling the unit impulse response according to the i/p signal values and adding them all is convolution.
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