What condition does over-modulation occur?
Explanation: When the voltage of the modulating signal exceeds the voltage of the carrier signal over-modulating occurs. Here, 12/10 = 1.2 which is greater than 1 and hence would cause over-modulation.
What is the purpose of over-modulation?
The over-modulation phenomenon is widely used in three- phase systems in order to extend the output voltage range by introducing third voltage harmonics in the modulation procedure. at the same time the size and efficiency can be improved.
What is the cause of over-modulation Mcq?
4. What is the cause of Overmodulation? Explanation: Overmodulation is the process in which the modulation index is greater than 1 such that the modulating signal voltage exceeds the required voltage to produce 100% modulation.
Why does over-modulation cause distortion?
In this case, the net amplitude of modulated signal is not always positive which means that there is phase reversal and thus the modulated signal does not exactly represent the information from message signal. Hence it says, over-modulation causes distortion.
What is over-modulation in AM state the value of modulation index for it?
Modulation Index It states the level of modulation that a carrier wave undergoes. It is called as Under-modulation. Such a wave is called as an under-modulated wave. If the value of the modulation index is greater than 1, i.e., 1.5 or so, then the wave will be an over-modulated wave.
What causes over-modulation in amplitude modulation?
Over-modulation occurs when the maximum amplitude of the message signal or modulating signal is greater than the maximum amplitude of the carrier signal (Am > Ac). The modulation index is the ratio of the maximum amplitude of the message signal to the maximum amplitude of carrier signal.
What is over modulation and under modulation?
This is often denoted in percentage called as Percentage Modulation. It is called as Under-modulation. Such a wave is called as an under-modulated wave. If the value of the modulation index is greater than 1, i.e., 1.5 or so, then the wave will be an over-modulated wave.
What is the effect if modulation index is greater than 1 over modulation )?
When the value of the modulation index goes more than one then it causes overmodulation which leads to distortion and causes the bandwidth to not be preserved.
What is over-modulation and under modulation?
What is maximum modulation index?
A modulation index of 1 is the maximum level of modulation that can normally be applied and occurs when the envelope increases by a factor of 1, i.e. twice the steady state value, and falls to zero.
What are over modulation and under modulation in AM?
For a perfect modulation, the value of modulation index should be 1, which means the modulation depth should be 100%. Such a wave is called as an under-modulated wave. If the value of the modulation index is greater than 1, i.e., 1.5 or so, then the wave will be an over-modulated wave.
What is over modulation and under-modulation?
What are the disadvantages of modulation?
Disadvantages of Amplitude Modulation: An amplitude modulation signal is not efficient in terms of its power usage. Power wastage takes place in DSB-FC (Double Side Band – Full Carrier ) transmission. It is not efficient in terms of its use of bandwidth. It requires a bandwidth equal to twice that of the highest audio frequency.
How to use “modulation” in a sentence?
Bit 59 ( no amplitude modulation ) is phase-modulated as a 0-bit.
What is an example of modulation?
Amplitude modulation (AM)