What is the function of a demodulator in communication systems?

The function of a demodulator is to convert received signals back to their original form. In communication systems, signals are often modulated for transmission over various media, which changes the signal's properties, such as its frequency or amplitude, to make it more suitable for sending over long distances or through different types of noise and interference.

Once the modulated signals reach their destination, the demodulator's role is to reverse this process, extracting the original information (such as voice, data, or video) from the modulated carrier wave. This recovery is crucial for the receiver to understand and utilize the incoming information effectively.

In summary, the primary role of a demodulator is to take the altered signals that have been transmitted and decode or demodulate them back to a format that can be interpreted by the end-user, ensuring accurate communication.