Table of Contents
- 1 What is the power relationship between the carrier and the modulating signal in AM?
- 2 What is the role of carrier signal in signal modulation?
- 3 What is modulation in physics?
- 4 What is the difference between modulation index and the percentage of modulation?
- 5 What happens to the modulation index of an AM signal if the modulating signal voltage is higher than the carrier signal voltage?
- 6 What is the effect if modulation index is greater than 1 over modulation )?
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 is the role of carrier signal in signal modulation?
In telecommunications, a carrier wave, carrier signal, or just carrier, is a waveform (usually sinusoidal) that is modulated (modified) with an information-bearing signal for the purpose of conveying information. This carrier wave usually has a much higher frequency than the input signal does.
What is the ideal relationship between the modulating signal voltage and the carrier voltage?
Explanation: When the modulation index is 1 or the percentage of modulation is 100, modulating signal voltage is equal to the carrier voltage. This results in the greatest output power at the transmitter and the greatest output voltage at the receiver, with no distortion.
What is modulation in physics?
Modulation in physics is the process of changing one or more properties of a periodic waveform, the carrier signal, with a modulating signal that typically contains information that is to be transmitted from one place to another.
What is the difference between modulation index and the percentage of modulation?
Multiplying the modulation index (m) by 100 gives the percent modulation. When the peak voltage of the modulating signal is equal to the peak voltage of the unmodulated carrier, the percent modulation is 100\%. An unmodulated carrier has a percent modulation of 0\%.
What is modulation index formula?
The FM modulation index is equal to the ratio of the frequency deviation to the modulating frequency. To give an example of the FM modulation index, take the example where a signal has a deviation of ±5kHz, and the modulating frequency is 1kHz, then the modulation index for this particular instance is 5 / 1 = 5.
What happens to the modulation index of an AM signal if the modulating signal voltage is higher than the carrier signal voltage?
An unmodulated carrier has a percent modulation of 0\%. When the peak voltage of the modulating signal (V m) exceeds the peak voltage of the unmodulated carrier (Ve) overmodulation will occur, resulting in distortion of the modulating (baseband) signal when it is recovered from the modulated carrier.
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.
What is modulation in wireless communication?
Modulation is the act of changing a signal to transmit useful data. The amplitude is the power or intensity of the signal, the frequency is how often the signal repeated itself, and the phase describes where in the cycle the waveform is with respect to time.