Baseband refers to the original frequency range of a transmission signal before it is converted, or modulated, to a different frequency range. For example, an audio signal may have a baseband range from 20 to 20,000 hertz. When it is transmitted on a radio frequency (RF), it is modulated to a much higher, inaudible, frequency range.
Signal modulation is used for radio broadcasts, as well as several types of telecommunications, including cell phone conversations and satellite transmissions. Therefore, most telecommunication protocols require original baseband signals to be modulated to a higher frequency before they are transmitted. These signals are then demodulated at the destination, so the recipient receives the original baseband signal. Dial-up modems are a good example of this process, since they modulate and demodulate signals when they are transmitted and received. In fact, the word “modem” is short for modulator/demodulator. There are some various use of baseband i will high light some of them below;
A baseband bandwidth is equal to the highest frequency of a signal or system, or an upper bound on such frequencies,for example the upper cut-off frequency of a passband filter. By contrast, a passband bandwidth is the difference between a highest frequency and a nonzero lowest frequency.
A baseband channel or lowpass channel (or system, or network) is a communication channel that can transfer frequencies that are very near zero.Examples are serial cables and local area networks (LANs), as opposed to passband channels such as radio frequency channels and passband filtered wires of the analog telephone network. Frequency division multiplexing (FDM) allows an analog telephone wire to carry a baseband telephone call, concurrently as one or several carrier-modulated telephone calls.
Baseband transmission, also known as Baseband modulation or line coding,aims at transferring a digital bit stream over a baseband channel, as an alternative to passband transmission, also known ascarrier-modulated transmission.
Baseband transmission in Ethernet
The word “BASE” in Ethernet physical layer standards, for example 10BASE5, 100BASE-T and 1000BASE-SX, implies baseband digital transmission, i.e. that a line code and an unfiltered wire are used.
A baseband processor is a chip in wireless transmission devices such as mobile phones, that performs signal processing and implements the device’s realtime radio transmission operations.
A baseband signal or lowpass signal is a signal that can include frequencies that are very near zero, by comparison with its highest frequency (for example, a sound waveform can be considered as a baseband signal, whereas a radio signal or any other modulated signal is not)
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