Dual Side Band Amplitude Modulation (DSB-AM) is a type of analog modulation technique used in radio communication to transmit information over a carrier wave. It works by varying the amplitude of the carrier wave in accordance with the modulating signal, which contains the information to be transmitted. This results in two sidebands being created, one above and one below the carrier frequency, hence the term "dual side band."
One advantage of DSB-AM is its simplicity, as it only requires a single multiplication in the modulator circuit. This makes it a cost-effective solution for transmitting information. Additionally, DSB-AM preserves the bandwidth of the original signal, making it suitable for transmitting high-quality audio signals.
DSB-AM is susceptible to noise interference, as both the carrier wave and the sidebands carry the same information. This can result in a lower signal-to-noise ratio and affect the quality of the received signal. DSB-AM also requires a large amount of power to transmit, making it less efficient compared to other modulation techniques.
DSB-AM is commonly used in AM radio broadcasting, where it is able to transmit audio signals over long distances. It is also used in some radar systems for detection and ranging purposes. Additionally, DSB-AM has applications in telephony, where it is used to transmit analog voice signals over telephone lines.
The main difference between DSB-AM and SSB modulation is that DSB-AM transmits both sidebands, while SSB only transmits one sideband. This makes SSB more efficient in terms of power and bandwidth usage. SSB is also less susceptible to noise interference, making it a preferred choice for long-distance communication. However, SSB requires more complex demodulation circuits, making it more expensive to implement compared to DSB-AM.