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Searching for Analog communication job?

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Then you are at the right place for getting good Analog communication job interview questions. Analog Communication is a data broadcasting method in a format that fioetype continuous signals to send out data including electrons, image, voice, video etc. An analog signal is a changeable signal continuous in both amplitude and time which is usually carried by use of modulation.

To know more about updates and expected interview questions aaptitude visit Analog communication job interview questions and answers page framed by wisdomjobs experts.

Pulse Amplitude Modulation is the process by which the amplitude of the regularly apyitude pulses varies according to the the amplitude of the modulating signal. Aliasing can be avoided if: Frequency Modulation can be defined as the frequency of the carrier wc is varied acc.

In case of Nyquist rate, the sampling frequency is equal to the maximum frequency of the signal and therefore the successive cycles of the spectrum does not overlap. What Is Amplitude Modulation? Amplitude Modulation is defined as the process in which the instantaneous value of aptitudd amplitude of the carrier is varied according to the amplitude of the modulating or base band signal.

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What Happens In Over Modulation? Modulation is defined as the process in which some characteristics of the signal called carrier is varied according to the modulating or baseband signal. In case of over modulation, the modulation index is greater than one and envelope distortion occurs. Name The Types Of Multiplexing? Multiplexing is defined as the tets in which a number of message signals are combined together to form composite signals so that they can be transmitted through the common channel.

What Is Sampling Theorem? Sampling is defined as the process in which an analog signals are converted into digital signals. It means that a continuous time signal is converted into a discrete time signal.

Sampling Theorem is defined as: What Is Under Sampling? Under sampling is also known as aliasing effect in which the the sampling frequency is less than the maximum frequency of the signal and therefore the fletype cycles of the spectrum overlap.

Modulation may be defined as the process by which some parameters of a high freuency signal termed as carrier, is varie in accordance with the signal to be transmitted. Amplitude modulation angle modulation. Consider, for example, picture signal of a T. It has freuency spectra of DC to 5.

However, filehype this signal is modulated with a carrier in VHF and UHF range, the percentage bandwidth becomes very small and the signal become suitable for transmission through atmosphere. Length of antenna is shortened, signal loss is reduced, ease of radiation, adjustment of bandwidth, shifting signal freuency of the assigned value. PWM system gives a greater signal to noise ratio as compared to PAM but reuires a larger bandwidth to achieve this.


What Is Pulse Position Modulation? Pulse position modulation PPM is the process in which the position of a standard pulse is varied as a function of the amplitude of the sampled signal. The phase deviation are usually small. The noise produces a smaller disturbing effect on the time position of the modulating pulse train and as a result, PPM waves have a better performance with respect to signal to noise ratio in ffiletype to PAM and PWM systems.

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It is primarily useful for optical communication systems, where there tends to be little or no multipath interference. Narrowband RF Radio freuency channels with low power and long wavelength i. It is possible to limit the propagation of errors to adjacent symbols, so that an error in measuring the differential delay of one pulse will affect only two symbols, instead of effecting all successive measurements.

One of the principle advantages of pulse position modulation is that it is an Mary modulation techniue that can be implemented noncoherently, such that the receiver does not need to use a phaselocked loop PLL to track the phase of the carrier. This makes it a suitable candidate for optical communications systems, where coherent phase modulation and detecting are difficult and extremely expensive.

The only other common Mary noncoherent modulation techniue is Mary freuency shift keying, which is the freuency domain dual to PPM. PPM is employed in narrowband RF channel systems, with the position of each pulse representing the angular position of an analogue control on the transmitter, or possible states of binary switch. The number of pulse per frame gives the number of controllable channels available.

Model aircraft reuire parts that are as lightweight zptitude possible. Explain The Principle Of Ppm? The amplitude and the width of the pulse is kept constant in this system, while the position of each pulse, in relation to the position of a recurrent reference pulse is varied by each instantaneous sampled value of the modulating wave.

This means that the transmitter must send synchronizing pulses to operate timing circuits in the receiver. The PPM has the advantage of reuiring constant transmitter power output, but the disadvantage apfitude depending on transmitterreceiver synchronization. PPM may be used to transmit analog information, such as continuous speech or data.

What Is Freuency Modulation fm? Freuency modulation is the process of varying the freuency of a carrier wave in proportion to the instantaneous amplitude of the modulating signal without any variation aptitkde the amplitude of the carrier wave. Explain The Principle Of Pwm?

Pulsewidth modulation PWM of a signal or power source involves the modulation of its duty cycle, to either convey information over a communication channel or control the amount of power sent to a load. PWM uses a suare wave whose pulse width is modulated resulting in the variation of the average value of the waveform is directly dependent on the duty cycle D.


Mention The Applications Of Pwm? PWM can be used to reduce the total amount of power delivered to a load without losses normally incurred when a power source is limited by resistive means. This is because the average power delivered is proportional to the modulation duty cycle.

With a sufficiently high modulation rate, passive electronic filters can be used to smooth the pulse train and recover an average analog waveform. Analog Communication Practice Tests.

The bandwidth required for transmitting is greater since the amplitude varies. Sampling frequency must be greater than the frequency of the modulating signal. The frequency should be band limited to maximum frequency of the signal fm Htz. If prealias filter is used. High selectivity and sensitivity. No change in Bandwidth that is bandwidth remains same all over the operating range. High adjacent channel rejection. FM are of 2 types: The two types of multiplexing are: In this technique, fixed frequency bands are allotted to every user in the complete channel bandwidth.

Such frequency is allotted to user on a continuous basis. When the pulse is present for the short time duration and most of the time their is no signal present inbetween them than this free space between the two pulses can occupied by the pulses from other channels.

This is known as Time Division Multiplexing. The other advantages of pulse position modulation are: The amplitude is held constant thus less noise interference. Signal and noise separation is very easy. Due to constant pulse widths and amplitudes, transmission power for each pulse is same.

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