From the course: Introduction to Telecommunications: Standards, Networks, and Innovations
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Modulation
From the course: Introduction to Telecommunications: Standards, Networks, and Innovations
Modulation
- [Instructor] Do you ever wonder how signals carry so much information across airwaves? It all comes down to modulation. It is a clever way of sending signals over air. Let's dive more into modulation and understand how it works and why it is so critical for reliable communication. Modulation is the process of taking a low-frequency signal, like a voice, and adjusting it to a higher frequency for better transmission. Low-frequency signals on their own cannot travel far. They fade quite quickly. But by mixing them with high-frequency signals, which is also known as carrier signals, we can boost them to travel over longer distances. Modulation solves two main problems. It reduces the size of antenna needed for transmission, and second, it reduces air interference. So, let's focus on the reduction of size of antenna. Imagine trying to transmit a human voice signal which is at a very low frequency. To send this unmodulated signal, you would need an antenna hundreds of meter long. By…
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