What type of modulation blends two signals into one?

The concept of blending two signals into one is intrinsic to the nature of modulation techniques used in communication systems. Amplitude modulation (AM) works by varying the strength (amplitude) of a carrier wave in proportion to the information signal, effectively superimposing the information onto the carrier. Similarly, frequency modulation (FM) alters the frequency of the carrier wave based on the amplitude of the information signal, creating a composite signal that retains the characteristics of both the carrier and the information signal. Phase modulation (PM) changes the phase of the carrier signal in accordance with the information signal, again leading to a mixture of the two signal forms.

Each of these modulation techniques blends a carrier wave with the information being transmitted, achieving the goal of conveying information via radio waves. Therefore, all these techniques can be described as methods that blend two signals into one, with each employing a different aspect of the carrier wave to represent the information.

This multifaceted approach to modulation is crucial for efficient radio communication, allowing for the transmission of audio, video, or data across various media, thus enhancing the ability to convey complex information effectively.