What happens when amplitude of modulating signal is higher than carrier signal?
When the amplitude of the modulating signal is greater than the amplitude of the carrier, distortion will occur. 5. What is the effect of distortion? Explanation: Distortion occurs when the modulating signal amplitude is greater than the amplitude of the carrier, causing incorrect information to be transmitted.
Why does amplitude modulation give noisy reception?
In amplitude modulation, the carrier is varied in accordance with the message signal. The higher the amplitude, the greater is the magnitude of the signal. So it’s easy for noise to disturb the amplitude modulated signal. Hence, amplitude modulation gives noisy reception.
What happens if the frequency of the carrier and message signal are same in amplitude modulation?
if the modulation index is greater than unity, the carrier wave becomes over modulated. The AM modulator must produce a carrier signal that varies in amplitude according to the shape of m(t). Because they are of the same frequency, no envelope is produced as they are changing at the same rate.
What is amplitude modulation change in?
In amplitude modulation, it is the voltage level of the signal to be transmitted that changes the amplitude of the carrier in proportion, see Figure 63.1. When the modulating information signal (a sine wave) is applied, the carrier amplitude rises and falls in accordance.
What happens in amplitude modulation?
Amplitude modulation is a process by which the wave signal is transmitted by modulating the amplitude of the signal. It is often called AM and is commonly used in transmitting a piece of information through a radio carrier wave. Amplitude modulation is mostly used in the form of electronic communication.
Why is amplitude modulation necessary?
To make the transmission possible, modulation was introduced, i.e., multiplying the message by a periodic signal such as a cosine ( Ω 0 t ) , the carrier, with a frequency much larger than those in the acoustic signal. Amplitude modulation provided the larger frequencies needed to reduce the size of the antenna.
Why amplitude modulation is needed?
What is the effect of carrier amplitude on audio modulation?
It is an indicator of the level of modulation. If there is too low a level of modulation then the amount of variation in carrier amplitude is small. Thus the audio signal being transmitted will not be very strong. Hence the modulation does not utilize the carrier efficiently.
What is the modulation index of AM wave?
The modulation index (μ a) of an amplitude-modulated wave is defined as the ratio of the amplitude of the modulating signal (Em) to the amplitude of the carrier wave (E c ). If for AM wave the maximum amplitude is ‘a’ while the minimum amplitude is ‘b’ E max = (E c + E m ) = a …………. (1)
What is amplitude modulation definition and mechanism?
In general, amplitude modulation definition is given as a type of modulation where the amplitude of the carrier wave is varied in some proportion with respect to the modulating data or the signal. As for the mechanism, when amplitude modulation is used there is a variation in the amplitude of the carrier.
What does the modulation factor depend on?
The value of the modulation factor depends upon the amplitude of the carrier wave and the signal. It is an indicator of the level of modulation. If there is too low a level of modulation then the amount of variation in carrier amplitude is small. Thus the audio signal being transmitted will not be very strong.