What is the formula for modulation index in AM?
Hint The modulation index for the total power of the modulated signal and carrier signal is related to total power and carrier power is given by PT=PC(1+ma22) .
What is the formula of amplitude modulation?
Equation 2 represents the carrier wave which is just another sinusoidal wave function. Equation 2. C(t) = Ac cos (2*pi*fc*t), Ac=3, fc=100 Hz, t=time. Equation 3 is the standard form of the modulated wave by the method of amplitude modulation.
What is AM modulation and demodulation?
Demodulation is a key process in the reception of any amplitude modulated signals whether used for broadcast or two way radio communication systems. Demodulation is the process by which the original information bearing signal, i.e. the modulation is extracted from the incoming overall received signal.
What is modulation index in PM system?
The modulation index (or modulation depth) of a modulation scheme describes by how much the modulated variable of the carrier signal varies around its unmodulated level.
How do you calculate the power of an AM signal?
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 BW AM Wave?
Bandwidth of the AM wave is the difference in the two extreme frequencies of the AM signal. It is given by. B= (ωc+ ωm)- (ωc- ωm) = ωm.
What happens to the AM waveform during the demodulation process?
What is modulation index for AM and FM?
Difference between Amplitude Modulation and Frequency Modulation
| Amplitude Modulation | Frequency Modulation |
|---|---|
| The AM frequency ranges from 535 kHz – 1705 kHz | The FM frequency ranges from 88 MHz – 108 MHz in the higher spectrum |
| The modulation index of AM ranges from 0 to 1 | The modulation index of FM is higher than 1 |
What is the bandwidth for AM wave?
This is the range of carrier frequencies available. The information transmitted is music and talk which falls in the audio spectrum. The full audio spectrum ranges up to 20 kHz, but AM radio limits the upper modulating frequency to 5 kHz. This results in a maximum bandwidth of 10 kHz.
What is amplitude modulated wave?
From equation 3 we can see Amplitude modulated wave is sum of three sine (or) cosine waves. There are three frequencies in amplitude modulated wave f 1, f 2 and f 3 corresponding to ω c, ω c + ω m and ω c – ω m respectively. Is the ratio of Amplitude of modulating signal to amplitude of the carrier wave.
How do you find the modulation index of a wave?
We can also determine the modulation index with the help of modulated wave. Assume, A max to be the maximum amplitude of the modulated signal and A min to be the minimum amplitude of the modulated signal. When the value of µ is 1, then it is said to be an ideal modulation.
How do you calculate the power of AM wave?
We can use the above formula to calculate the power of AM wave, when the carrier power and the modulation index are known. 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.
How do you calculate modulation power from multiple sine waves?
Modulation by Several Sine Waves: In most applications, carrier is simultaneously modulated by several sinusoidal modulating voltages. We may calculate the resulting modulated carrier power. Procedure consists in calculating the total modulating index and then substituting it in equation (15) to calculate the total power Pt.