ANALYSIS, DESIGN AND QUANTIZING NOISE PERFORMANCE EVALUATION OF ADAPTIVE DELTA MODULATION SYSTEM

Abstract

Delta modulation is essentially equivalent to a two level differential pulse code modulation (DIEM). Since it is a specialized derivative of the convential pulse code modulation (FCM) the review in chapter I deals how normal FCM come to be prefered over analog systems and how delta modulation (DM) system developed to the recent improved systems. Chapter II considers the various parts of a PCM system and an improvement to the linear DM system requiring the presence of a predictors and continues with a description of exponential and delta-sigma modulation systems. Since a contant factor DM (CFDM) system is a delta modulator into which instantaneous camnpa .ding has been introduced, so chapter III covers the various companding schemes and their applications in delta modulation systems. This chapter also considers the different types of adaptive delta modulation systems. The analysis of quantization noise in adaptive delta modulation system for Gaussian input signal is described in Chapter IV, and the expressions for granular and slope overload noises and that of rms signal—to—quantization noise ratio are indicated. Chapter V introduces the procedures to calculate the rms signal—to—quart izat ion noise ratio with different. normalized step sizes by computer. This chapter also describes the comparison of results with theoretical principles. Chapter VI is concerned with the hardware implementation and design of a first order constant factor DM system with details of different ICs used. The last chapter includes conclusion and suggestions for :future work. The computer programs written for calculation of noises, and the output lists are contained in Appendices A and B respectively. Though we have included all possible details of the system under consideration, it may be worthwhile to refer to some manual etc. while designing the other systems.