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What else can I help you with?
Conclusion about amplitude modulation?
A carrier is used to make the wavelength smaller for practical transmission and to permit multiplexing. The spectrum is used to measure bandwidth (the range of frequencies) and the efficiency (the power in the side-bands compared to the total power) Bandwidth can be predicted using BW = 2 fm where fm = the maximum modulating frequency Efficiency depends only on the modulating index, m (the fraction of the carrier you modulate by) AM is limited to 33% efficiency because the modulation index cannot be increased to > 1.0 without introducing distortion in the receiver.
Why do you use delta-sigma modulation instead of delta modulation?
Delta sigma modulation achieves "noise shaping" that essentially high-pass filters the quantization noise. This reduces the noise power in the baseband so that oversampling can access more bits of useful signal resolution than would be possible in the presence of the unfiltered noise.
What is a SSBSC signal?
Single Side Band Suppressed Carrier. This is a modification of AM (Amplitude Modulation) that both reduces required transmitter power and signal bandwidth. The carrier is first modulated by the signal the same as in ordinary AM, then is sent through a bandpass filter to remove one sideband and the carrier. To demodulate it and recover the original signal the receiver must reinsert the carrier using a BFO (Beat Frequency Oscillator) and Mixer.
What is the function of an attenuator in cro?
An attenuator is an electronic device that reduces the amplitude or power of a signal without appreciably distorting its waveform. attenuator just decrease its amplitude and the attenuator you can take it as a opposite of amplifier. Amplifier just modifies the input signal gives amplified output signal
Is exponential signal an energy signal or power signal?
If the signal is not bounded by a step function, then an exponential signal is neither a power nor an energy signal. So the answer is neither.
How transmitted power is related to modulation index in am?
In amplitude modulation (AM), the modulation index (m) represents the ratio of the peak amplitude of the modulating signal to the peak amplitude of the carrier signal. The transmitted power in an AM signal increases with the modulation index, as higher modulation indices lead to greater variations in the carrier's amplitude. Specifically, the total transmitted power can be expressed as a function of the carrier power and the modulation index, with more power being allocated to sidebands as m increases. However, beyond a certain point, further increasing the modulation index can lead to distortion, as the signal may exceed the linear range of the amplifier.
What transmmited power when modulation index 0 to 1?
It can be anything at all, from yoctowatts to terawatts. You must state the power output at some modulation index before I can calculate it for some other modulation index. By the way . . . the answer also depends on the method of modulation, which you have not mentioned. For example, with pure FM, the transmitted power doesn't change, regardless of the mod-index.
AM power content of the carrier is maximum when modulation index is?
The AM power content of the carrier is maximum when the modulation index is zero. At this point, there is no modulation applied to the carrier signal, meaning the entire power is concentrated in the carrier frequency itself. As the modulation index increases, the power is distributed between the carrier and the sidebands, resulting in a decrease in the carrier's power content. Thus, maximum carrier power occurs at zero modulation.
What is the significance of modulating index?
The modulation index is a crucial parameter in communication systems that determines the extent of modulation applied to a carrier signal. It affects the bandwidth and power efficiency of the transmitted signal, influencing the quality and clarity of the received information. In amplitude modulation (AM), a higher modulation index can lead to better signal strength but may result in distortion if exceeded. Overall, understanding and controlling the modulation index is essential for optimizing communication performance.
What do you think is a carrier's maximum modulation index without over-modulation?
The maximum modulation index for a carrier signal without resulting in over-modulation typically depends on the modulation scheme being used. For standard amplitude modulation (AM), the maximum modulation index is generally 1, meaning the peak envelope power of the modulated signal should not exceed the carrier power. In frequency modulation (FM), the modulation index can be higher, but it should still be kept within limits defined by the system to avoid distortion. Ultimately, the precise value can vary based on specific application requirements and the desired quality of the transmitted signal.
Why is it desirable to have the modulation index of an AM signal as large as possible without overmodulating?
It uses the maximum power available to the transmitter and makes the signal more readable at a greater distance.
Compare high level modulation and low level modulation?
IN LOW LEVEL MODULATION THE MODULATING SIGNAL IS APPLIED NEARER THE CARRIER OSCILLATOR N IN HGH LEVEL MODULATION MODULATING SIGNAL IS APPLIED AT OUTPUT OF FINAL POWER AMPLIFIER OR FAR FROM CARRIER OSCILLATOR... IN OTHER WORDS :::: IN HAIGH LEVEL MODULATION THE AF SIGNAL IS APPLIED TO COLLECTOR OR PLATE AS THEIR RESPECTIVE DEVICES..... N IN LOW LEVEL MODULATION AF SIGNAL IS APPLIED AT BASE OR GRID IN TRANSISTOR AND TUBES RESPECTIVILY IN LOW LEVEL MODULATION THE MODULATING SIGNAL IS APPLIED NEARER THE CARRIER OSCILLATOR N IN HGH LEVEL MODULATION MODULATING SIGNAL IS APPLIED AT OUTPUT OF FINAL POWER AMPLIFIER OR FAR FROM CARRIER OSCILLATOR... IN OTHER WORDS :::: IN HAIGH LEVEL MODULATION THE AF SIGNAL IS APPLIED TO COLLECTOR OR PLATE AS THEIR RESPECTIVE DEVICES..... N IN LOW LEVEL MODULATION AF SIGNAL IS APPLIED AT BASE OR GRID IN TRANSISTOR AND TUBES RESPECTIVILY
What is percentage power saving if AM transmitter with modulation index m equals 0.5 is replaced by SSBSC transmitter with same modulation index?
The percentage power saving when replacing an AM transmitter with modulation index of 0.5 with an SSBSC transmitter with the same modulation index would be approximately 93.75%. This is because SSBSC transmitters only transmit one sideband, while AM transmitters transmit both sidebands, resulting in less power usage and more efficiency.
What effects of the internal laser diode capacitance on the output optical power?
The internal laser diode capacitance affects the output optical power by influencing the modulation response and frequency performance of the diode. High capacitance can lead to slower response times, reducing the ability to modulate the output power effectively at high frequencies. This can result in a decrease in overall optical power output during rapid modulation scenarios. Additionally, increased capacitance may lead to signal distortion, further impacting the quality and stability of the emitted optical power.
Why amplitude modulation is called as collector modulation?
amplitude modulation using collector modulator gives:More symmetrical envelope• Higher power efficiency• Higher output power• Need higher amplitude modulatingsignal
Why is AM modulation not an efficient way of modulation?
-- The power output stage in the transmitter must be operated either class A or class B. Whereas in FM the power output stage in the transmitter can operate class C which uses much less power per watt delivered to the antenna. -- For full modulation, audio power is required equal to 1/2 of the RF power of the transmitter output stage. -- At full modulation, 2/3 of the total power arriving at the receiver is at the carrier frequency, which conveys none of the information. -- A receiver designed for AM reception is susceptible to a wide variety of natural and man-made noise.
Define the bandwidth of a frequency modulated signal?
I believe the bandwidth of ANY signal is defined as the range of frequencies that encompasses 99% of the signal's power. For an AM signal at anything less than 100% modulation, it's 2 x the highest modulating frequency. FM signals aren't that simple to characterize. "Cramer's Rule" says that the bandwidth is 2 x (peak deviation + highest modulating frequency), but as the 'modulation index' increases, that rule becomes a poorer approximation.
