What is the relationship between the message amplitude and the amount of the carrier modulation?
You probably noticed that the size of the message signal and the modulation of the carrier are proportional. That is, as the message’s amplitude goes up, the amount of the carrier’s modulation goes up. including calculating the distribution of the signal’s power between the carrier and sidebands.
What is the relationship between the message signal’s amplitude and the FM signal bandwidth?
Frequency modulation (FM) Because the frequency of a radio wave is less vulnerable to noise than the amplitude, FM was originally introduced to reduce noise and improve the quality of radio reception. In order to accomplish this, FM radio signals have bandwidth several times that of AM signals.
How does the message signal amplitude affect the carrier signal?
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.
What is the power relationship between the carrier and the modulating signal in AM?
If the modulation index μ=1 then the power of AM wave is equal to 1.5 times the carrier power. So, the power required for transmitting an AM wave is 1.5 times the carrier power for a perfect modulation.
What happens when the amplitude of modulating signal is greater than the 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.
What are the relationship between the modulating signal frequency and the bandwidth in a conventional AM system?
In other words the bandwidth occupied by the AM signal is twice the maximum frequency of the signal that is used to modulated the carrier, i.e. it is twice the bandwidth of the audio signal to be carried.
What is the difference between FSK and FM?
Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. FSK is widely used in computer modems, such as fax modems, telephone caller ID systems, garage door openers, and other low-frequency transmissions. Radioteletype also uses FSK.
How amplitude of carrier signal is varied in accordance with message signal discuss the process in detail?
In the continuous-wave modulation, a high frequency sine wave is used as a carrier wave. If the amplitude of the high frequency carrier wave is varied in accordance with the instantaneous amplitude of the modulating signal, then such a technique is called as Amplitude Modulation.
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. The modulation index is the amount of modulation that is done on a carrier signal.