digital transmission

Digital transmission is the science and practice of sending information using electromagnetic means, with a focus on transmitting large volumes of data over long distances with minimal loss due to noise and interference. This technology is crucial for modern telecommunication systems, enabling the transmission of voice, data, radio, and television signals.1

To achieve high reliability and lower costs compared to analog systems, digital transmission is employed. Analog signals, common in voice, radio, and television, must first be converted to a digital format through analog-to-digital conversion. Data signals, already digital, bypass this step.1

Before transmission, digital signals often undergo source encoding to reduce redundancy and channel encoding to detect and correct errors. The signal is then modulated onto a carrier wave and may be multiplexed with other signals before being sent through a transmission channel. The process is reversed at the receiving end to extract the original information. Digital television, for instance, uses compression techniques to fit signals into existing channels, though this can sometimes result in minor quality compromises.12