basebandsignaaleista

Baseband signals are the raw information signals transmitted in their original form without any modulation. They represent the actual data, such as voice, video, or digital data, as it exists before being processed for transmission over a communication channel. The term "baseband" refers to the lowest frequency band that a signal occupies. In a baseband signal, the information is directly encoded in the amplitude, frequency, or phase of the signal itself.

When a signal is transmitted at baseband, it means it is sent directly over a medium without being shifted to a higher frequency. This is often the case for short-distance communication, like within a local area network (LAN) or when using wired connections. For longer distances or when multiple signals need to share the same transmission medium, modulation is used. Modulation shifts the baseband signal to a higher carrier frequency, allowing it to travel further and preventing interference between different signals.

Examples of baseband signals include the audio signal from a microphone before it is amplified or modulated for radio transmission, or the raw digital data stream before it is encoded and modulated for Wi-Fi or cellular communication. The characteristics of a baseband signal, such as its bandwidth and spectrum, are directly related to the information it carries. Understanding baseband signals is fundamental to comprehending various communication systems and signal processing techniques.