Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
FIG - Basic Group Arrangement
FIG - Channel Translating Equipment
reate a directory "Unix" under your home directory. Command(s): ………………………………………….
The function noise.m, now installed on ashland too, adds Gaussian, salt, uniform and pepper, additive or multiplicative noise to an image
One that can be modified by the class even when the object of the class or the member function doing the modification is const.
What is the difference between wire and reg Wire Wire is used for designing combinational logic, as we all know that this type of logic cannot store a value. As you can
Which approaches do not require knowledge of the system state? Ans. Deadlock detection, deadlock prevention and deadlock avoidance; none of the given require knowledge of the s
Circuits can be designed to implement a specifictaske.g. a simple circuit could compare two inputvoltages and give a high output if they matched anda low output if they did not mat
Design goals: The correct form of a computer system depends on the constraints and aim for which it was optimized. Computer architectures frequently trade off cost, standard
Discuss the advantages of automatic switching systems over manual switching system. Automatic switching systems have some advantages over the manual exchanges: 1. In a manua
(a) What is Grid computing? (b) What are the key distinctions between conventional distributed computing and Grid computing? (b) Describe how five features of Grid Computi
program in c for scanline seed fill
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd