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!
Q. Discuss FDM and illustrate how CCITT stndards help in building the base band?
Ans:
Frequency Division Multiplexing: It is the process of combining numerous information channels by shifting their signals to different frequency groups within spectrum so that they can be transmitted simultaneously over common transmission facility.
Bandwidth of a telephone speech signal is rather less than 4 kHz. While the available bandwidth on unloaded cables pair, is well above 100 kHz. It is consequently possible, using modulation techniques, to divide up cable bandwidth so that anumber of telephone speech paths can be carried simultaneously along a single cable pair. Normal arrangement comprises 24 telephone channels per cable pair, modulation into 24 channels being carried out in two stages. In first stage, 12 channels are multiplexed together to form what is commonly termed as a basic group. 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 from 64 kHz to 108 kHz. Lower side-band (LSB) is used in each case. 12 base-band signals are therefore translated into frequency band from 60 kHz 108 kHz as shown. Block diagram for channel translating equipment is given in figure. To form a 24-channel system, to basic groups are taken together. One basic group (B) is transmitted directly as it stands. Other basic group (A) is amplitude modulated on to a carrier are 120 kHz and lower side-band is taken so as to occupy frequency range from 12 kHz to 60 kHz as demonstrated in figure by using two stages of modulation for basic group A, it is probable to reduce the physical size of component required for LSB filters of the figureas the lowest cut- off frequency required is at 64 kHz rather than 12 kHz if the whole block of 24 channels were assembled together in one stage of modulation.
Q. Explain Radio and Television Broadcasting? Radio (AM and FM) and television broadcasting are the most familiar forms of communication via analog transmission systems. The re
Q. Explain about Common Control? Common Control: Those systems in which the control subsystem is outside the switching network are known as common control switching system. Str
Explain the NEG instruction. NEG: Two's complement or arithmetic sign inversion (NEG). The NEG instruction two's complements a number that means that the arithmetic sign of a
Decision Making The rhombus diamond symbol is used to represent the decision making process as shown below. Figure De
cite a specific example in which the engineer must provide maximum efficiency for a given cost.
adadaaaaaaaaaaaaaaaaaaaaaaascaacacaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaAsk question #Minimum 100 words accepteda
Subtract Contents of Memory and Borrow from Accumulator The contents of the memory pointed by the HL register pair and the borrow flag are subtracted from the contents
A 100-kW, 230-V shunt generator has R a = 0.05 and R f = 57.5 . If the generator operates at rated voltage, calculate the induced voltage at (a) full load, and (b) one-half fu
advantages and disadvantages of thevenin theorem
Build an intersection traffic light using the LED's as in the diagram below Day Use the LED's on the trainer (port 11) Main Street and Side Street alternate. Mai
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd