system input and output

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47amadb

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hello every one:

can any body answer these questions:

1) if the output of the system is greater than the input, what is the device called?give an example? where would we apply such a device in a system?

2) if the output of the system is less than the input, what is the device called? give an example? where would we apply such a device in a system?


thanks and wainting for your answers....
 

Answer 1 = Amplifier. You use amplifiers to make a desired signal stronger.

Answer 2 = Filter. You use a filter to weak unwanted signals.
 

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