# FAQ: Am Fm Modulation Matlab?

## How do you do FM modulation in Matlab?

FM Modulate a Sinusoidal Signal

1. Open Live Script.
2. fs = 1000; fc = 200; t = (0:1/fs:0.2)’;
3. x = sin(2*pi*30*t)+2*sin(2*pi*60*t);
4. fDev = 50;
5. y = fmmod(x,fc,fs,fDev);
6. plot(t,x,’c’,t,y,’b–‘) xlabel(‘Time (s)’) ylabel(‘Amplitude’) legend(‘Original Signal’,’Modulated Signal’)

## What is frequency modulation in Matlab?

Frequency modulation is the encoding of data in a carrier wave by changing the immediate frequency of the wave. In other words in frequency modulation, the frequency, as opposed to the amplitude of the carrier wave, is made to change in relation to the differing amplitude of the modulating signal.

## How do you do amplitude modulation in Matlab?

Amplitude modulation in MATLAB can be achieved by using the ammod() function. ammod()

1. x: amplitude signal.
2. Fc: carrier signal frequency.
3. Fs: sampling frequency.
4. ini_phase: initial phase in the modulated signal y in radians.
5. carramp: carrier amplitude of the modulated signal.

## What is FM and AM modulation?

Frequency modulation (FM) and amplitude modulation (AM) are used to transmit data in the form of electromagnetic waves. While AM follows the process of modulating the amplitude of the carrier wave where frequency remains constant, in case of FM, the wave frequency varies, and amplitude remains constant.

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## How does FM demodulator work?

In any radio that is designed to receive frequency modulated signals there is some form of FM demodulator or detector. This circuit takes in frequency modulated RF signals and takes the modulation from the signal to output only the modulation that had been applied at the transmitter.

## How do you do frequency modulation?

FM signals can be generated either by using direct frequency modulation, which is achieved by inputting a message directly into a voltage-controlled oscillator, or by using indirect frequency modulation, which is achieved by integrating a message signal to generate a phase-modulated signal, which is then used to

## What is FC FM?

The frequency of a carrier (fc) will increase as the amplitude of modulating (input) signal increases. The carrier frequency will be maximum (fc max) when the input signal is at its peak. The carrier deviates maximum from its normal value. The modulation of these signals will result in an FM modulated signal.

## What is the modulation index of FM?

∴ mf=6.25. Therefore, the modulation index of an FM signal is 6.25. Note: The carrier signal is the high frequency signal that has a certain phase, frequency and amplitude but does not contain any information.

## What does modulation index mean?

Modulation index is defined as the ratio of the fundamental component amplitude of the line-to-neutral inverter output voltage to one-half of the available DC bus voltage.

## What is the formula for modulation index?

The FM modulation index is equal to the ratio of the frequency deviation to the modulating frequency. From the formula and definition of the modulation index, it can be seen that there is no term that includes the carrier frequency and this means that it is totally independent of the carrier frequency.

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## What do you mean by amplitude modulation?

Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the carrier wave is varied in proportion to that of the message signal, such as an audio signal.

## Which is better AM or FM?

” FM, which stands for Frequency Modulation, has better sound quality due to higher bandwidth. Also, the way the audio is encoded for FM makes it less sensitive to interference from electrical activity from storms or electrical devices than AM.

## What are disadvantages of FM?

Disadvantages of FM: Much more Bandwidth (as much as 20 times as much). Frequency Modulation

• Improved signal to noise ratio (about 25dB) w.r.t. to man made interference.
• Smaller geographical interference between neighboring stations.