Real-time application of DPCM and ADM systems

Digital communication techniques make the process of modulating a message feasible for transmission. However, a common problem with commonly used techniques, such as Pulse Coded Modulation (PCM) and Linear Delta Modulation (LDM), is that they negatively affect the communication process by causing quantization error, slope overload distortion, and granular noise. This paper discusses the implementation of two modulation systems, Adaptive Delta Modulation (ADM) and Differential Pulse Coded Modulation (DPCM), in order to solve the aforementioned problems. The latter solves the quantization error faced by the PCM and the former solves the slope overload distortion and granular noise faced by LDM. These two systems are implemented using Simulink (The Math Works, Inc., Natick, MA, USA) on a multithreaded processor computer, are tested in real-time, and are subjected to different kinds of noise.