# Often asked: Am And Fm Modulation Index?

## What is the modulation index of AM?

Introduction. In AM schemes, the modulation index refers to the amplitude ratio of the modulating signal to the carrier signal. With the help of Fast-Fourier-Transforms (FFT), the modulation index can be obtained by measuring the sideband amplitude and the carrier amplitude.

## What is difference between AM and FM modulation?

The difference is in how the carrier wave is modulated, or altered. With AM radio, the amplitude, or overall strength, of the signal is varied to incorporate the sound information. With FM, the frequency (the number of times each second that the current changes direction) of the carrier signal is varied.

## 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 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.

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## What are the advantages of AM over FM?

The main advantages of FM over AM are: Improved signal to noise ratio (about 25dB) w.r.t. to man made interference. Smaller geographical interference between neighboring stations. Less radiated power.

## Where do we use AM and FM?

Answer: FM is used for voice signal modulation and AM is used for video signal modulation. Answer: We use AM for video signals like TV & for motion picture.FM use for audio signals like radio & for voice signals.

## What is the maximum modulation index?

A modulation index of 1 is the maximum level of modulation that can normally be applied and occurs when the envelope increases by a factor of 1, i.e. twice the steady state value, and falls to zero.

## What do AM and FM stand for?

AM and FM modulated signals for radio. AM (Amplitude Modulation) and FM (Frequency Modulation) are types of modulation (coding). The electrical signal from program material, usually coming from a studio, is mixed with a carrier wave of a specific frequency, then broadcast.

## Why does AM radio exist?

The decline in AM audio was due more to regulation than to method of modulation. One aspect of radio not understood by most listeners is the concept of occupied bandwidth, or the amount of spectrum that a station uses to transmit its signal. It displays signals within a specified range of frequencies.

## Why do we use FM?

FM broadcasting is capable of higher fidelity—that is, more accurate reproduction of the original program sound—than other broadcasting technologies, such as AM broadcasting. Therefore, FM is used for most broadcasts of music or general audio (in the audio spectrum).

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## Can modulation index in FM be greater than 1?

When we have a modulation index of value greater than 1, say 1.5 then the modulating signal has a greater amplitude which causes part of the information to get lost in the process of modulation. This is termed as overmodulation. So the recovered signal is always distorted. Hence, option B. is also correct.

## Can modulation index be greater than 1?

If the modulation index is greater than 1, then we call this condition over modulation. In such cases, the baseband signal is not preserved in the envelope of the AM signal and therefore, the recovered signal is distorted at the output of the receiver.

## How can I make FM signal?

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