I know that a Schmitt trigger is used to reduce noise in a circuit, but why does noise need to be reduced.
How does noise effect the overall circuit and what benefits do you achieve by reducing noise using a Schmitt trigger ?
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why does noise need to be reduced
Noise needs to be tackled because it creates problems.
One example below:
Assume the output signal is a pulse from a circuit which counts number of people entering a door. If the noise is not addressed, it will count wrong number of people. Connecting the orange pulse directly to a pulse counter will lead to wrong counts. Connecting the green pulse(Schmidt trigger output) will give more accurate results.
There is one good note on schmitt trigger.