Types of Sampling Techniques: Basically there are three types of sampling techniques : (i) Instantaneous sampling, (ii) Natural sampling and (iii) Flat-top sampling. Out of these three types of sampling techniques, instantaneous sampling is called ideal sampling whereas natural sampling and flat-top sampling are called practical sampling methods. Instantaneous Sampling or Impulse Sampling or Ideal […]
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Facsimile (FAX) Machine – Definition, Operation and Applications: In addition to the basic signals consisting of speech, music, or telegraph codes, a telecommunications system is often required to transmit signals from a source of a visual nature. Facsimile (commonly called FAX) means an exact reproduction, and in facsimile transmission an exact reproduction of a document
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Monochrome TV Transmitter – Block Diagram and its Workings: The term monochrome stands for black and white. Thus a monochrome TV system does not process variations of colour in a picture but processes only the intensity of brightness of each pixel for transmission in space. The picture is reproduced on the fluorescent screen of the
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Digital Modulation Techniques: An information bearing signal can be transmitted from one point to another point over a communication channel by using either an analog technique or digital modulation techniques. As already discussed, the use of digital technique offers several important advantages as compared to analog technique. In particular, a digital communication system offers the
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Advantages and Disadvantages of Digital Communication: The advantages and disadvantages of digital communication are as follows, Digital communication have the following advantages: 1. The digital communication systems are simpler and cheaper compared to analog communication systems because of the advancements made in the IC technologies. 2. In digital communication, the speech, video and other data
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Basic Elements of Digital Communication System: Figure 23.3 shows the functional diagram and the basic elements of digital communication system. The source output may be either an analog signal like audio or video signal, or a digital signal, such as the output of a teletype machine, that is discrete in time and has a finite
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What is Analog Signal and Digital Signal? What is Analog Signal and Digital Signal? – In communication systems, a signal means a time varying electrical signal which contains all information or intelligence. The analog signal is that type of signal which varies smoothly and continuously with time. This means that analog signals are defined for
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