Which term describes altering a sound wave to represent a binary 1 or 0?

Which term describes altering a sound wave to represent a binary 1 or 0?

• A. Modulation
• B. Demodulation
• C. Encoding
• D. Sampling

Answer: (A)

Modulation is the process of changing a carrier signal to carry information. To represent a binary 1 or 0 on a sound wave, the transmitter alters the carrier’s properties—such as amplitude, frequency, or phase—so each bit changes the carrier in a recognizable way. This lets digital data travel over analog channels or over long distances. Demodulation is the reverse operation, pulling the original bits out of the modulated signal. Sampling is about taking discrete measurements of a continuous signal, not directly encoding bits onto a carrier, and encoding refers to mapping data into a code or symbols before transmission, not necessarily the act of altering the waveform itself.

Modulation is the process of changing a carrier signal to carry information. To represent a binary 1 or 0 on a sound wave, the transmitter alters the carrier’s properties—such as amplitude, frequency, or phase—so each bit changes the carrier in a recognizable way. This lets digital data travel over analog channels or over long distances. Demodulation is the reverse operation, pulling the original bits out of the modulated signal. Sampling is about taking discrete measurements of a continuous signal, not directly encoding bits onto a carrier, and encoding refers to mapping data into a code or symbols before transmission, not necessarily the act of altering the waveform itself.