modulatsioonimäär

Modulatsioonimäär, also known as modulation index, is a dimensionless quantity used in communication systems to describe the depth of modulation of a carrier wave. It is defined as the ratio of the peak amplitude of the modulating signal to the peak amplitude of the carrier wave. The modulation index is a crucial parameter in amplitude modulation (AM) systems, as it determines the efficiency and quality of the transmitted signal.

In AM, the modulation index (m) is given by the formula m = A_m / A_c, where A_m is the amplitude of the modulating signal and A_c is the amplitude of the carrier wave. The modulation index can range from 0 to 1, with 0 indicating no modulation and 1 indicating full modulation. A modulation index of 1 is often used in practice, as it provides a good balance between power efficiency and signal quality.

The modulation index also affects the bandwidth of the modulated signal. As the modulation index increases, the bandwidth of the modulated signal also increases. This is because the sidebands, which carry the information in the modulating signal, become wider and more pronounced. Therefore, in designing communication systems, it is important to carefully select the modulation index to ensure that the transmitted signal meets the required bandwidth and power efficiency specifications.

In summary, the modulation index is a key parameter in amplitude modulation systems, as it determines the depth of modulation, power efficiency, and bandwidth of the transmitted signal. By carefully selecting the modulation index, communication engineers can optimize the performance of their systems to meet the desired specifications.