TAILIEUCHUNG - Delta Modulation

Most real world signals of practical interest, such as speech, radar signals, sonar signals, and various communication signals such as audio and video signals are analog. To process an analog signal by digital means, it is vital to convert it into digital form. That is to convert it to a sequence of numbers having finite precision. This procedure is called analog-to-digital (A/D) conversion, and the corresponding devices are called A/D converters. However, modern demands for precise, fast transmission and processing of such signals coupled with the recent advances in VLSI technology has resulted in the necessity of cost-effective and highly. | LAB REPORT EXPERIMENT 9 DELTA MODUALATION DELTA MODULATION Purpose The objectives of this laboratory are 1. To demonstrate delta-modulation 2. To convert an analog signal into a 3 bit digital Equipment List 1 . PC with Matlab and Simulink DELTA MODULATION Most real world signals of practical interest such as speech radar signals sonar signals and various communication signals such as audio and video signals are analog. To process an analog signal by digital means it is vital to convert it into digital form. That is to convert it to a sequence of numbers having finite precision. This procedure is called analog-to-digital A D conversion and the corresponding devices are called A D converters. However modern demands for precise fast transmission and processing of such signals coupled with the recent advances in VLSI technology has resulted in the necessity of cost-effective and highly accurate A D converters. Sigma-delta modulation has recently become the choice for high resolution A D conversion. The sigma-delta modulator which forms a significant part of an A D converter uses the concept of oversampling the signal and shaping the noise out of the band of interest. The benefits of such an oversampled noise-shaping converter include inherent linearity and high tolerance to circuit imperfection. The block diagram of a general sigma-delta modulator is shown below. The sigma-delta modulator consists of a discrete time integrator a quantizer and a D A converter in the feedback path. The discrete time integrator accumulator is modeled as an adder and a unity delayor in the feed-forward path with unity feedback. The role of the feedback in the sigma-delta modulator structure is to force the average value of the quantized signal to track the input. By doing that any difference between them is accumulated in the discrete time integrator and eventually the system corrects itself. A qualitative description of a conventional first-order S-D modulator is given below. The .

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