What is Oscillator? - Types of Oscillators: An oscillator is the basic element of all ac signal sources and generates sinusoidal signals of known frequency and amplitude. It is one of the basic and useful…
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…
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…
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…
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…
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…
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…
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…
Visual Display Units (VDUs): Large arrays of characters can be built up using alphanumeric devices, already discussed, but the number of connections and the complexity of the drive-logic circuitry increase significantly, although large-scale integrated (LSI)…
Cold Cathode Display or Nixie Tube - Operation and Characteristics: These are the most well known type of alphanumeric displays. They operate on the basis of emission of light in a cold cathode gas filled…
