Which type of signals is used for computer data and digital audio?

• A. Analog Signals
• B. Digital Signals
• C. Mixed Signals
• D. Power Signals

Answer: (B)

Digital signals are used for computer data and digital audio because computers operate on discrete binary states and digital circuits process these states reliably. Representing information as 0s and 1s makes storage in memory straightforward, enables error detection and correction, and allows efficient, noise-resistant transmission. In digital audio, sound starts as an analog waveform, but it is sampled at regular intervals and quantized into a finite number of levels, turning it into digital data that can be stored, edited, and transmitted. A digital-to-analog converter then recreates the audible signal when played. Analog signals are continuous and more susceptible to noise and distortion, which makes exact reproduction and reliable processing harder in these contexts.