Which modulation is not one of the main methods to convey information via a carrier wave?

Continuous Modulation is not one of the primary methods used to convey information via a carrier wave. In the realm of communication systems, the main modulation techniques include Amplitude Modulation (AM), Frequency Modulation (FM), and Pulse Modulation (PM).

Amplitude Modulation (AM) conveys information by varying the amplitude of the carrier wave, while frequency modulation (FM) does so by varying the frequency of the carrier wave. Pulse modulation involves the transmission of information through pulses which can be varied in terms of width, position, or amplitude, allowing for digital representation of signals.

Continuous modulation, on the other hand, is not typically classified as a standard method in the same way as the others. While it might refer to ongoing or continuous signals, it lacks the specific modulation techniques that define how information is encoded onto a carrier wave in communication systems. Therefore, it's less relevant in the context of established modulation techniques used for data transmission.