What type of modulation is primarily used in digital audio broadcasting?

Frequency Modulation (FM) is primarily used in digital audio broadcasting because it provides better sound quality and improved performance in the presence of noise and interference compared to other modulation methods. FM is particularly effective for transmitting a wide range of audio frequencies, which is essential for ensuring clarity and fidelity in audio broadcasts.

In the context of digital audio broadcasting, FM allows for enhanced data transmission rates, enabling high fidelity audio signals to be transmitted alongside additional information, such as metadata. This makes FM a preferred choice for digital audio applications, delivering robust reception in various environments and contributing to the overall listener experience.

Other modulation methods, such as Amplitude Modulation (AM), while useful for analog broadcasting, do not perform as effectively in terms of sound quality under varying conditions. Phase Modulation (PM) and Spectral Modulation (SM) are less commonly associated with mainstream digital audio broadcasting frameworks. FM's resilience to noise and its capacity for high-fidelity audio transmission are key factors that solidify its usage in this domain.