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. Analog communication systems?
An analog message is a continuum of possible amplitudes at any given time, and analog signals are continuous in time and in amplitude, such as audio and video signals. When the message to be sent over a communication system is analog, we refer to the system as analog. The transmitted waveform must be some function of the message so that the receiver could decipher the message. Usually the transmittedwaveformis the result of varying either the amplitude, phase, or frequency of a basic signal called a carrier. Combinations of amplitude, phase, and frequency variations are also possible.
The carrier usually is sinusoidal of the form Ac cos (ωct + φc), where Ac, φc, and fc = ωc/2π are the carrier's amplitude, phase, and frequency, respectively.WhenAis varied as a linear function of the message, amplitude modulation (AM) occurs. In phase modulation (PM) a phase term that is a linear function of themessage is added to the carrier.When the added phase is a linear function of the integral of the message, the result is known as frequency modulation (FM). Note that the carrier's frequency in FM is a linear function of the message, because instantaneous angular frequency is the time derivative of instantaneous phase. Thus, FM and PM are closely related. Every communication system has a modulator at the transmitting station to structure the transmitted waveform, and a demodulator (detector) at the receiving end to recover the message from the received signal. Radio (AM and FM) and television broadcasting are the most familiar forms of communication through analog signal transmission. The FCC in the United States regulates the carrier-frequency assignments in order to minimize the interference between nearby stations. Commercial AM radio broadcasting utilizes the frequency band of 535 to 1605 kHz for the transmission of voice and music. The carrier-frequency allocations range from 540 kHz to 1600 kHz, with 10-kHz spacing. Each station can occupy a channel bandwidth of only 10 kHz centered on its carrier. Even though the basebandmessage signal is limited to a bandwidth of about 5 kHz, the AMbroadcasting system adequately meets the need for low-cost mass communication and general audio entertainment, in spite of lacking high-fidelity behavior.
Static or Electronic Energy Meters Electronic energy meters are replacing traditional electromechanical meters in several residential, commercial and industrial applications s
a 4 bit synchronous counter uses flip flops with propagation delay times of 15ns each. what will be the maximum possible time requires for change of state?
what are theold and new technologies of manufaturing of the harvestor. atleast of five components
A squirrel-cage inductionmotor operates at a slip of 0.05 at full load. The rotor current at starting is five times the rotor current at full load. Neglecting stator resistance and
Athree-phase, 440-V, 60-Hz, four-pole induction motor operates at a slip of 0.025 at full load, with its rotor circuit short-circuited. This motor is to be operated on a 50-Hz supp
In this case, the armature is connected in series with the field coils. Thus I a = I f = I NB. At starting, the back emf is zero (because the m
Field-Effect Transistor: The field-effect transistor that is abbreviated as FET relies on an electric field to control the shape and therefore the conductivity of a channel of
Q. Addition and integration can be combined by the summing integrator circuit shown in Figure. With the given component values and input waveforms, sketch v o when S is opened at
Phenomenon - Fet operation: For either improvement- or depletion-mode devices, at drain-to-source voltages very much less than gate-to-source voltages, changing the gate volta
Give the names of four alloys along with their composition, which are used for making heater and thermocouple elements. Constantan or Eureka {(55 to 60 percent) Cu, (45 to 40 p
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