Two systems with impulse responses h1(t) and h2 (t) are connected in c...
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Two systems with impulse responses h1(t) and h2 (t) are connected in c...
Impulse Response of a System
The impulse response of a system represents its output when the input is an impulse function, which is a very short duration signal with unit amplitude. It characterizes the behavior of the system and provides information about how the system responds to different inputs.
Cascade Connection of Systems
When two systems are connected in cascade, the output of the first system becomes the input to the second system. In this configuration, the overall impulse response of the cascaded system can be determined.
Overall Impulse Response
To find the overall impulse response of the cascaded system, we need to consider the impulse response of each individual system and determine how they combine.
Convolution of Impulse Responses
The correct answer to this question is option 'C', which states that the overall impulse response of the cascaded system is the convolution of the impulse responses of the individual systems. Convolution is a mathematical operation that combines two functions to produce a third function. In this case, it combines the impulse responses of the two systems.
Mathematical Explanation
Let h1(t) be the impulse response of the first system and h2(t) be the impulse response of the second system. The convolution of h1(t) and h2(t) is given by:
h(t) = ∫[h1(tau) * h2(t - tau)] dtau
This equation represents the overall impulse response of the cascaded system. It describes how the output of the first system, represented by h1(t), is transformed by the second system, represented by h2(t), to produce the final output of the cascaded system.
Example
To illustrate this concept, let's consider a simple example. Suppose h1(t) is a system with impulse response [1, 2, 3] and h2(t) is a system with impulse response [4, 5]. The convolution of h1(t) and h2(t) would be:
h(t) = [4, 13, 22, 15]
This represents the overall impulse response of the cascaded system.
Conclusion
In summary, when two systems are connected in cascade, the overall impulse response of the cascaded system is obtained by convolving the impulse responses of the individual systems. This operation combines the characteristics of both systems to determine the overall behavior of the cascaded system. Therefore, option 'C' is the correct answer.
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