Digital versus Analog signals: which type is characterized by on or off states?

Digital versus Analog signals: which type is characterized by on or off states?

• A. Analog
• B. Digital
• C. Hybrid
• D. Pulse Width

Answer: (B)

Two-state signaling is the hallmark of digital signals. Digital signals encode information with discrete levels, typically representing binary 1 and 0 as distinct on and off (high and low) voltages. This makes the signal take only two possible states at any moment, which is what defines its digital nature. By contrast, analog signals vary continuously in amplitude over time, so they aren’t limited to just on or off. A hybrid combines both continuous and discrete aspects, which isn’t the pure on/off characteristic described here. Pulse width describes a modulation technique that uses different pulse widths within on/off pulses; it’s about how the signal is shaped rather than the fundamental two-state type of the signal.

Two-state signaling is the hallmark of digital signals. Digital signals encode information with discrete levels, typically representing binary 1 and 0 as distinct on and off (high and low) voltages. This makes the signal take only two possible states at any moment, which is what defines its digital nature. By contrast, analog signals vary continuously in amplitude over time, so they aren’t limited to just on or off. A hybrid combines both continuous and discrete aspects, which isn’t the pure on/off characteristic described here. Pulse width describes a modulation technique that uses different pulse widths within on/off pulses; it’s about how the signal is shaped rather than the fundamental two-state type of the signal.