What type of signals does analog modulation handle?

Analog modulation is a technique used to encode information onto a carrier signal by varying its amplitude, frequency, or phase. The correct choice refers to continuous signals, which are essential in analog modulation. This process enables the signal to represent a range of values, such as voice or music, in a smooth manner without abrupt changes that characterize digital signals.

In analog modulation, as the information signal varies continuously over time, the corresponding alterations in the carrier signal result in a range of amplitudes and frequencies. This characteristic allows for the quality and richness of the analog signal, making it suitable for various applications like traditional radio broadcasting or voice communication.

The other types of signals mentioned are not suited to analog modulation techniques. Pulsed signals often exhibit discrete levels, and while they might represent information, they do not carry the continuous nature required for analog modulation. Discrete signals pertain more to digital communication methods, where information is represented in binary form, rather than the continuous variations seen in analog methods. Random noise signals can interfere with communication but do not fit the requirements for effective modulation as they lack a structured waveform.

Thus, the choice highlighting continuous signals that vary in amplitude or frequency aptly represents the fundamental principle of analog modulation.