Which type of signal is typically used to represent natural sounds or sensor voltages?

• A. Analog Signals
• B. Digital Signals
• C. Pulsed Signals
• D. Random Signals

Answer: (A)

Natural sounds and sensor voltages vary smoothly over time, so they are represented as analog signals. An analog signal can take any value within a continuous range, capturing the exact waveform of a sound or the instantaneous voltage as it changes. This preserves the fine detail of amplitude and timing without approximation. Digital signals encode information with discrete levels, requiring sampling and quantization, which introduces small errors but is great for storage and processing. Pulsed signals are bursts of energy used for timing or modulation, not the natural continuous variation itself. Random signals describe unpredictable variation and aren’t a standard way to represent real-world measurements. So the typical representation for natural sounds or sensor voltages is analog signals.