Subträgerfrequenzen

Subträgerfrequenzen, also known as subcarrier frequencies, are carrier frequencies that are modulated onto a main carrier wave. This technique is used in various telecommunications and broadcasting systems to transmit multiple signals simultaneously over a single channel. By using different subcarrier frequencies, each signal occupies a distinct portion of the bandwidth, preventing interference.

A common application of subcarrier frequencies is in FM radio broadcasting for transmitting stereo sound. The main carrier wave carries the monaural sum signal, while separate subcarrier frequencies are used for the left and right channel difference signals. The receiver then combines these signals to reconstruct the stereo audio. Another example is in cable television systems, where different channels are transmitted on distinct carrier frequencies, and within each channel, subcarrier frequencies can be used for additional services like analog audio or data.

The selection of subcarrier frequencies is crucial. They must be chosen such that they do not overlap with the main carrier frequency or other subcarrier frequencies within the same system. This spacing ensures efficient use of the available bandwidth and minimizes signal degradation. The modulation schemes used on these subcarriers can vary, including amplitude modulation (AM) or frequency modulation (FM), depending on the specific application and the type of information being transmitted. Subcarrier frequencies are a fundamental concept in multiplexing techniques, enabling the efficient and simultaneous transmission of multiple information streams.