Modulaatioväli

Modulaatioväli refers to the range of frequencies occupied by a modulated signal. In radio communication, a carrier wave is modified by an information-bearing signal. This modification, or modulation, causes the resulting signal to spread out over a certain bandwidth. The extent of this frequency spread is the modulation interval. Different modulation techniques, such as amplitude modulation (AM) and frequency modulation (FM), result in different modulation intervals.

The modulation interval is a crucial parameter in radio system design. It determines the channel capacity, meaning how much information can be transmitted per unit of time. A wider modulation interval allows for higher data rates but requires a broader frequency allocation, which can be a scarce resource. Conversely, a narrower modulation interval conserves spectrum but limits the achievable data rate.

Understanding and accurately calculating the modulation interval is essential for efficient spectrum utilization and effective communication system planning. It influences the selection of filters, antennas, and other components in the transmission and reception chain. The relationship between the modulation interval, the information signal's bandwidth, and the modulation technique is a fundamental concept in telecommunications.