Define modulation.

Define modulation.
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1 Answer

Answer :

The process of varying one or more characteristics of an optical  signal to encode and convey information.
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Related questions

Which cavity of a three-cavity klystron causes most of the velocity modulation?

Description : Which cavity of a three-cavity klystron causes most of the velocity modulation?

Last Answer : The middle cavity.

What can be added to the basic two-cavity klystron to increase the amount of velocity modulation and the power output?

Description : What can be added to the basic two-cavity klystron to increase the amount of velocity modulation and the power output?

Last Answer : Intermediate cavities between the input and output cavities.

What types of modulation are shipboard receive-only equipment designed to receive?

Description : What types of modulation are shipboard receive-only equipment designed to receive?

Last Answer : Fm or psk.

What type of modulation do most analog fiber optic communications systems use?

Description : What type of modulation do most analog fiber optic communications systems use?

Last Answer : Intensity modulation.

Which junction of the transistor in the common-emitter detector detects the modulation envelope?

Description : Which junction of the transistor in the common-emitter detector detects the modulation envelope?

Last Answer : Emitter-base junction

Phase-shift keying is similar to what other two types of modulation?

Description : Phase-shift keying is similar to what other two types of modulation?

Last Answer : Cw and frequency-shift keying.

What type of modulation depends on the carrier-wave phase shift?

Description : What type of modulation depends on the carrier-wave phase shift?

Last Answer : Phase.

How is the degree of modulation expressed in an fm system?

Description : How is the degree of modulation expressed in an fm system?

Last Answer : As the ratio of the frequency deviation to the maximum frequency deviation allowable.

What characteristic of a carrier wave is varied in frequency modulation?

Description : What characteristic of a carrier wave is varied in frequency modulation?

Last Answer : Instantaneous frequency.

Name the modulation system in which the frequency alternates between two discrete values in response to the opening and closing of a key?

Description : Name the modulation system in which the frequency alternates between two discrete values in response to the opening and closing of a key?

Last Answer : . Frequency-shift keying.

What are the two types of angle modulation?

Description : What are the two types of angle modulation?

Last Answer : Frequency and phase.

What is the primary advantage of pulse-modulation systems?

Description : What is the primary advantage of pulse-modulation systems?

Last Answer : . Low susceptibility to noise.

Pulse-code modulation requires the use of approximations of value that are obtained by what process?

Description : Pulse-code modulation requires the use of approximations of value that are obtained by what process?

Last Answer : Quantization.

What is pulse-frequency modulation?

Description : What is pulse-frequency modulation?

Last Answer : A method of pulse modulation in which a modulating wave is used to frequency modulate a pulse-generating circuit

What is the main disadvantage of pulse-position modulation?

Description : What is the main disadvantage of pulse-position modulation?

Last Answer : It requires synchronization between the transmitter and receiver.

Which edges of the pulse can be modulated in pulse duration modulation?

Description : Which edges of the pulse can be modulated in pulse duration modulation?

Last Answer : Either, or both at the same time.

What characteristics of a pulse can be changed in pulse time modulation?

Description : What characteristics of a pulse can be changed in pulse time modulation?

Last Answer : The time duration of the pulses or the time of occurrence of the pulses.

What, if any, noise susceptibility advantage exists for pulse-amplitude modulation over analog amplitude modulation?

Description : What, if any, noise susceptibility advantage exists for pulse-amplitude modulation over analog amplitude modulation?

Last Answer : Both are susceptible to noise and interference

To ensure the accuracy of a transmission, what is the minimum number of times a modulating wave should be sampled in pulse modulation?

Description : To ensure the accuracy of a transmission, what is the minimum number of times a modulating wave should be sampled in pulse modulation?

Last Answer : 2.5 times the highest modulating frequency.

What action is necessary to impress intelligence on the pulse train in pulse modulation?

Description : What action is necessary to impress intelligence on the pulse train in pulse modulation?

Last Answer : Some characteristic of the pulses has to be varied.

With a single modulating tone, what is the amplitude of the sideband frequencies at 100-percent modulation?

Description : With a single modulating tone, what is the amplitude of the sideband frequencies at 100-percent modulation?

Last Answer : One-half the amplitude of the carrier.

What is percent of modulation?

Description : What is percent of modulation?

Last Answer : The depth or degree of modulation.

How much must the fpa plate current vary to produce 100- percent modulation in a plate modulator?

Description : How much must the fpa plate current vary to produce 100- percent modulation in a plate modulator?

Last Answer : Between 0 and nearly two times its unmodulated value.

What is high-level modulation?

Description : What is high-level modulation?

Last Answer : Modulation produced in the plate circuit of the last radio stage of the system.

What is modulation?

Description : What is modulation?

Last Answer : Modulation is the impressing of intelligence on a transmission medium.

What is amplitude modulation?

Description : What is amplitude modulation?

Last Answer : Any method of modulating an electromagnetic carrier frequency by varying its amplitude in accordance with the intelligence.

Define Delta modulation.

Description : Define Delta modulation. 

Last Answer : Delta modulation is a technique in which derivative of the signal is quantized. The delta modulation shows slope overload for fast input signals and their performance is dependent on input signal frequency.

Define FSK modulation.

Description : Define FSK modulation.

Last Answer : FSK is a type of frequency modulation ,in which the binary data or code is transmitted by means of a carrier frequency that is shifted between two fixed frequency namely mark(logic1) and space frequency(logic 0).

Define modulation? State the desirable value of modulation index of AM.

Description : Define modulation? State the desirable value of modulation index of AM.

Last Answer : Modulation: It is the process in which any of these Parameters (Amplitude, Frequency, Phase) of high frequency signal (carrier signal) are varied in accordance with low frequency signal(modulating signal) For an AM, modulation index range is 0 to 1.

Define pulse modulation. State its types.

Description : Define pulse modulation. State its types. 

Last Answer : Pulse Modulation - consists essentially of sampling analog information signals and then converting those samples into discrete pulses. OR It consists essentially of sampling analog information signals and then converting those ... PAM - PWM - PPM  ii) Digital Pulse Modulation - PCM - DM - ADM 

Define modulation index in FM. What is maximum value of deviation ratio.

Description : Define modulation index in FM. What is maximum value of deviation ratio.

Last Answer : Modulation Index of FM: It is defined as the ratio of Frequency Deviation (δ) to the modulating signal frequency (fm). (OR)  

Define modulation index in AM and give its formula.

Description : Define modulation index in AM and give its formula.

Last Answer : In AM wave, the modulation index (m) is defined as the ratio of the amplitude of the modulating signal (Vm ) to the amplitude of carrier signal (Vc). m = Vm / Vc

Define modulation index of FM.

Description : Define modulation index of FM.

Last Answer : Modulation index of FM is defined as the ratio of the frequency deviation to the modulating frequency.

Define the metal solvent action that takes place when copper conductors are soldered together.

Description : Define the metal solvent action that takes place when copper conductors are soldered together.

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Define thermal inertia.

Description : Define thermal inertia.

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Define the term "torque."

Description : Define the term "torque."

Last Answer : A measure of how much load a machine can turn.

Define matter and list its three different states.

Description : Define matter and list its three different states.

Last Answer : Anything that occupies space and has weight. Solid, liquid, and gas.

Define the term negative temperature coefficient.

Description : Define the term negative temperature coefficient.

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Define a fiber optic splice.

Description : Define a fiber optic splice.

Last Answer : A permanent fiber joint whose purpose is to establish an optical connection between two individual optical fibers.

Define the loss in optical power through a connection.

Description : Define the loss in optical power through a connection.

Last Answer : loss = 10log

Semiconductor LEDs emit incoherent light. Define incoherent light

Description : Semiconductor LEDs emit incoherent light. Define incoherent light

Last Answer : Light waves that lack a fixed-phase relationship

Define responsivity.

Description : Define responsivity.

Last Answer : The ratio of the optical detector's output photocurrent in amperes to the incident optical power in watts.

Define receiver dynamic range.

Description : Define receiver dynamic range.

Last Answer : The range of optical power levels over which the receiver operates within the specified values. It

List the key operational parameters used to define receiver performance.

Description : List the key operational parameters used to define receiver performance.

Last Answer : Receiver sensitivity, bandwidth, and dynamic range.

Define mutual inductance.

Description : Define mutual inductance.

Last Answer : Mutual inductance is the property existing between two coils so positioned that flux from one coil cuts the windings of the other coil.

Define inductanc

Description : Define inductancanc

Last Answer : Inductance is the property of a coil (or circuit) which opposes any CHANGE in current.

Define baud.

Description : Define baud.

Last Answer : A unit of modulation rate.

Define cladding diameter.

Description : Define cladding diameter.

Last Answer : The cladding diameter is the average diameter of the cladding.

Extrinsic (OH) absorption peaks define three regions or windows of preferred operation. List the three windows of operation.

Description : Extrinsic (OH) absorption peaks define three regions or windows of preferred operation. List the three windows of operation.

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Define attenuation.

Description : Define attenuation.

Last Answer : Attenuation is the loss of optical power as light travels along the fiber.