**Sideband**
**Definition:**
A sideband is a band of frequencies that appears above or below a carrier frequency in a modulated signal. It contains the actual information transmitted in amplitude, frequency, or phase modulation.
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## Sideband
In telecommunications and signal processing, a sideband refers to the range of frequencies produced as a result of modulating a carrier wave. When a carrier signal is modulated by an information signal, new frequencies are generated at the sum and difference of the carrier and modulating frequencies. These new frequencies form the upper and lower sidebands.
### Types of Sidebands
– **Upper Sideband (USB):** Frequencies higher than the carrier frequency.
– **Lower Sideband (LSB):** Frequencies lower than the carrier frequency.
### Applications
Sidebands are fundamental in radio communications, including amplitude modulation (AM), single sideband (SSB) transmission, and frequency modulation (FM). In SSB, only one sideband is transmitted to improve bandwidth efficiency. Sidebands also play a role in radar and audio signal processing.
### Importance
Understanding sidebands is crucial for designing efficient communication systems, minimizing interference, and optimizing bandwidth usage.
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**Meta Description:**
A sideband is a frequency band generated around a carrier frequency during modulation, carrying the transmitted information. It is essential in various communication technologies for efficient signal transmission.