Adaptive digital pulse code modulation is a signal processing technique used to convert analog signals into digital signals. There are several different terms that can be used as synonyms for this technique, including adaptively differential pulse code modulation, differential pulse code modulation, and adaptive pulse code modulation. Each of these terms represents a slightly different approach to the process of converting analog signals into digital ones, but all are designed to improve the accuracy, resolution, and efficiency of digital signal processing. In general, adaptive digital pulse code modulation techniques are widely used in a variety of applications, including telecommunications, audio and video compression, and data storage and retrieval.