Pulse code modulation: Pulse code modulation is a digital sign of an analog signal that takes samples of the amplitude of the analog signal at usual intervals. The sampled analog data is changed and then represented in the form of binary data Solution Pulse code modulation: Pulse code modulation is a digital sign of an analog signal that takes samples of the amplitude of the analog signal at usual intervals. The sampled analog data is changed and then represented in the form of binary data.