Contents
- 1 What happens when the amplitude of the modulating signal is greater than amplitude of the carrier?
- 2 Why carrier waves are of higher frequency compared to modulating signal?
- 3 Why frequency of carrier is high?
- 4 How is the amplitude of an AM signal affected by amplitude modulation?
- 5 How is the carrier wave represented as a sine?
What happens when the amplitude of the modulating signal is greater than amplitude of the carrier?
Explanation: Distortion occurs when the modulating signal amplitude is greater than the amplitude of the carrier, causing incorrect information to be transmitted.
Why carrier waves are of higher frequency compared to modulating signal?
A carrier wave is an electromagnetic wave that is modulated in amplitude or frequency to carry a signal. We need the carrier waves of high frequency for distant communication because high frequency carrier waves travel with the speed of light and do not require a material medium to propagate.
Why frequency of carrier is high?
To increase the energy of the signal we need to increase the frequency. This is achieved by multiplying the message signal with the carrier signal (with high frequency). this is when the carrier frequency is higher , and we noticed that bandwidth is just twice of the highest frequency of modulating signal.
How is the modulation factor related to the carrier wave?
As amplitude modulation is simple it is widely used. The ratio of change of amplitude of the carrier wave to the amplitude of the normal carrier wave is called the modulation factor. It describes the depth of modulation i.e. the extent in the variation of the amplitude of carrier wave due to the signal.
How does the amplitude of an AM carrier change?
In AM, the voltage or power level of the information signal changes the amplitude of the carrier in proportion (see Fig. 7.7 ). With no modulation, the AM carrier is transmitted by itself. When the modulating information signal (a sine wave) is applied, the carrier amplitude rises and falls in accordance.
How is the amplitude of an AM signal affected by amplitude modulation?
Amplitude Modulation. In amplitude modulation, the voltage or power level of the information signal changes the amplitude of the carrier in proportion (see Figure 7.7). With no modulation, the AM carrier is transmitted by itself. When the modulating information signal (a sine wave) is applied, the carrier amplitude rises and falls in accordance.
How is the carrier wave represented as a sine?
A carrier wave can be represented as a sine (or) cosine. C(t) = A c sin (ω c t + Ɵ) Also Read: Frequency Modulation VS Amplitude Modulation. Amplitude Phase. If we vary the amplitude of the carrier wave in accordance with the modulating signal (input signal) it is known as Amplitude Modulation.