Modulationsstärke

Modulationsstärke refers to the strength or depth of modulation applied to a carrier wave in radio communication. It quantifies how much the carrier wave's properties, such as amplitude or frequency, are altered by the modulating signal. In amplitude modulation (AM), modulationsstärke is often expressed as the modulation index, which is the ratio of the amplitude of the modulating signal to the amplitude of the carrier wave. A higher modulation index means a stronger modulation and a larger variation in the carrier's amplitude. In frequency modulation (FM), modulationsstärke is related to the frequency deviation, which is the maximum shift in the carrier frequency caused by the modulating signal. A larger frequency deviation indicates a stronger modulation. The modulationsstärke is a crucial parameter as it directly affects the signal-to-noise ratio and the intelligibility or quality of the transmitted information. Over-modulation, where the modulation index exceeds 100% in AM or the frequency deviation is too large in FM, can lead to distortion and loss of information. Conversely, under-modulation results in a weak signal and poor reception. Therefore, achieving an optimal modulationsstärke is essential for efficient and clear radio transmission. The term is also sometimes used more broadly to describe the intensity or prominence of any modulation effect.