Explain frequency division multiplexing, Computer Engineering

Assignment Help:

Explain FDM and show how CCITT standards help in building the base band?

Frequency Division Multiplexing: This is the process of combining some information channels through shifting their signals to various frequency groups in the spectrum therefore they can be transmitted simultaneously over common transmission service.

The bandwidth of a telephone speech signal is quite less than 4 kHz. Where, the available bandwidth on unloaded cables pair is fine above 100 kHz. Therefore this is possible, by using modulation techniques, for divide up the cable bandwidth then a number of telephone speech paths can be carried at the same time along a single cable pair. The normal arrangement contains 24 telephone channels per cable pair, the modulation in 24 channels being carried out within the two stages. In the primary stage, 12 channels are multiplexed together to form that is commonly termed as a basic group. This basic group arrangement is demonstrated in figure. Each of the 12 telephone signals are single side-band amplitude modulated on to carriers spaced at 4 kHz intervals 64 kHz to 108 kHz. The lower side-band (LSB) is utilized in every case. The 12 base-band signals are thus translated in the frequency band from 60 kHz 108 kHz as demonstrated. The block diagram for the channel translating equipment is specified in figure. To form a 24-channel system, to basic groups are occupied together. One basic group (B) is transmitted directly as this stands. Another basic group (A) is amplitude modulated on to a carrier are 120 kHz and the lower side-band is occupied such as to take the frequency range from 12 kHz to 60 kHz as demonstrated in figure. by using two stages of modulation for basic group A, this is possible to decrease the physical size of the component needed for the LSB filters of the figure, because the lowest cut- off frequency needed is at 64 kHz quite than 12 kHz when the whole block of 24 channels were assembled together in one stage of modulation.

855_Basic Group Arrangement.png

FIG - Basic Group Arrangement

1635_Channel Translating Equipment.png

FIG - Channel Translating Equipment


Related Discussions:- Explain frequency division multiplexing

Explain integrated disk electronics devices, Q. Explain Integrated Disk Ele...

Q. Explain Integrated Disk Electronics Devices? IDE devices are associated to PC motherboard by a 34-wire ribbon cable. Common drive used today for workstations has capacities

Create a social network application, A software development company wants t...

A software development company wants to create a social network application where users can post brief audio messages giving their thoughts. Each user of the application will ha

. net is compile time or runtime environment, . NET is Compile Time OR RunT...

. NET is Compile Time OR RunTime Environment?   .Net's framework has CLS,CTS and CLR.CTS checks declaration of types at the time when u write code and CLS explains some rules a

Show the liability of cpu in interrupt cycle, Q. Show the liability of CPU ...

Q. Show the liability of CPU in interrupt cycle? In the interrupt cycle the liability of CPU/Processor is to ensure whether any interrupts have happened checking presence of in

What is status control and registers, Q. What is Status Control and Registe...

Q. What is Status Control and Registers? Status Control and Registers: These registers can't be used by programmers though are used to control CPU or execution of a program.

Learn synchronization principles, Q. Learn synchronization principles? ...

Q. Learn synchronization principles? To learn synchronization subsequent dependencies are recognized:  i)  Data Dependency: These are RAW, WAW and WAR dependency.  ii) Co

Define the half duplex transmission, Define the Half Duplex Transmission ...

Define the Half Duplex Transmission A half-duplex channel can receive andsend, but not at the same time. It's like a one-lane bridge where two-way traffic should give way in

Coding advantages of casex or casez, Coding advantages of casex or casez ...

Coding advantages of casex or casez By using casex or casez has the following coding advantages: -  It reduces number of lines, especially if the number of bits had been m

C LANGUAGE PROGRAMME, find a c program to find the area under the curve y=f...

find a c program to find the area under the curve y=f(x) between x=a and x=b,intregrate y=f(x)between the limits of a and b.the area under a curve between two points can be found b

E-R DIAGRAM, In academic year a researcher can either be employed as a prof...

In academic year a researcher can either be employed as a professor or a lab assistant.there are three kinds of professors: assistant,associate and full professors.drow E-R DIAGRAM

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd