Analog and Digital Transmission

Analog and Digital Transmission

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Table of Contents

Introduction         

 Examples of Analog and Digital Transmission        4

Flow Rates        5

Characteristics of Analog Signal Flow Rates        5

 Characteristics of Digital Signal Flow Rates        6

Conclusion        6

References        

Introduction

The analog signal transmission utilizes signals that are accurate replicas of a picture or sound being transmitted. Consequently, signals whose amplitude and frequency vary are added to transporter waves. These waves have a particular frequency of electromagnetic current. Upon the addition of the signals, the carrier waves generate a continuous electric wave. Analog signal is derived from the fact that the variations in the transporter waves are analogous or are similar to the voice variation itself.  For instance, in such analog transmission as a telephone system, the reproduction of sound waves in a pattern, or an electric current is transmitted via a wire connection into the telephone receiver. Upon the completion of this the electric wave is converted back into sound waves (Morley & Parker, 2012).

In digital transmission, the sound waves received are not converted into electric current as in analog transmission. Instead, they are transformed into a binary code. This binary code has two elements namely the non-positive and positive. The basic examples of digital transmission are the “off” and “on” flashing of light and the Morse code. Number 1 is used to express the positive code while number 0 is used to express the non-positive code. This means that numbers expressed as a series of 1s and 0s constitute binary numbers. In a binary number, every digit is termed as a bit. A bit stands for a power of two. For instance, if the binary number is 101, the digit 1 at the right stands for 1 x 2º. On the other hand, the 0 digit in the middle stands for 0 x 2¹, while the digit 1 to the far left stands for 1 x 2². Binary 101 therefore, has a decimal equivalent of (1 x 2²) + (0 x 2¹) + (1 x 2º) = 4 + 0 + 1 = 5. Most of the computers use a standard code in which 8 bits are used in expressing letter "A." these 8 bits are 01000001 (Yarlagadda, 2010).

Examples of Analog and Digital Transmission

Some of the examples of analog digital transmission include VCRs, old televisions, audio tapes, old land-line telephones and photocopiers. On the other hand, some of the examples of digital transmission include coded light signals generated by swiftly flashing laser movements via optical fibers and a particular kind of digital telephone system. The receiver decodes these kinds of transmissions. During the telephone conversation transmission, the light flashes off an on approximately four hundred and fifty million times for every second. This high transmission rate makes it possible for two optical fibers to convey approximately 15000 conversations at ago. Therefore, digital transmission is suitable for electronic communication since the string of 0s and 1s can be transmitted using a series of off /on signals that the pulses of light and electricity represent. When the pulse is “on” it is represented by binary digit 1. When there is no pulse, in other words when the pulse is “off” binary digit 0 represents it. The electronic storage of this kind of information is very easy. In addition, the transmission of digital signals involves less disturbances and noise and is faster as compared to the transmission of analog signals (Bandyopadhyay, 2005).