What is the role of a modulator in the transmission process?

The role of a modulator in the transmission process is primarily to create new frequencies from two signals. The modulator takes the baseband signal, which carries the information (such as audio, video, or data), and combines it with a higher frequency carrier wave. This combination results in a modulated signal that can be effectively transmitted over various media, such as air, coaxial cables, or fiber optics.

This process is essential because the baseband signal itself typically exists at a low frequency, which is not suitable for long-distance transmission due to limitations like attenuation and interference. By modulating the signal onto a higher frequency carrier, it becomes more resilient to these issues, allowing it to travel further and with greater clarity.

Understanding the function of a modulator is crucial in various fields, including telecommunications, broadcasting, and data networking, as it directly impacts the efficiency and effectiveness of signal transmission.