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Modulation Index Formula

GoModulation Index with respect to Power Formula

GoModulation Index with respect to Amplitude Sensitivity Formula

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Modulation Index states the level of modulation that a carrier wave undergoes. Check FAQs

μ = \frac{A m}{A c}

μ - Modulation Index?A_m - Amplitude of Modulating Signal?A_c - Amplitude of Carrier Signal?

Modulation Index Example

With values

With units

Only example

Here is how the Modulation Index equation looks like with Values.

Here is how the Modulation Index equation looks like with Units.

Here is how the Modulation Index equation looks like.

0.36 = \frac{6.12}{17}

0.36 = \frac{6.12V}{17V}

0.36 = \frac{6.12}{17}

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Modulation Index Solution

Follow our step by step solution on how to calculate Modulation Index?

FIRST Step Consider the formula

μ = \frac{A m}{A c}

Next Step Substitute values of Variables

∴

μ = \frac{6.12V}{17V}

Next Step Prepare to Evaluate

∴

μ = \frac{6.12}{17}

LAST Step Evaluate

∴

μ = 0.36

Modulation Index Formula Elements

Variables

Modulation Index

Modulation Index states the level of modulation that a carrier wave undergoes.

Symbol: μ

Measurement: NAUnit: Unitless

Note: Value should be greater than 0.

Formulas to find Modulation Index

Amplitude of Modulating Signal

Amplitude of Modulating Signal is the maximum displacement of the signal from its equilibrium or rest position, measured in units of the original signal amplitude.

Symbol: A_m

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Amplitude of Modulating Signal

Amplitude of Carrier Signal

Amplitude of Carrier Signal is varied in accordance with the instantaneous amplitude of the modulating signal. The modulating signal is the signal that contains the information to be transmitted.

Symbol: A_c

Measurement: Electric PotentialUnit: V

Note: Value should be greater than 0.

Formulas to find Amplitude of Carrier Signal

Other Formulas to find Modulation Index

Go Modulation Index with respect to Power

μ = \sqrt{2 \cdot ((\frac{P T}{P c(avg)}) - 1)}

Go Modulation Index with respect to Amplitude Sensitivity

μ = K a \cdot A m

Go Modulation Index with respect to Maximum and Minimum Amplitude

μ = \frac{A max - A min}{A max + A min}

Other formulas in Fundamentals of Analog Communications category

Go Crest Factor

CF = \frac{X peak}{X rms}

Go Transmission Efficiency with respect to Modulation Index

η am = \frac{μ^{2}}{2 + μ^{2}}

Go Intermediate Frequency

f im = (f lo - F RF)

Go Image Frequency

f img = F RF + (2 \cdot f im)

How to Evaluate Modulation Index?

Modulation Index evaluator uses Modulation Index = Amplitude of Modulating Signal/Amplitude of Carrier Signal to evaluate the Modulation Index, 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. It is defined differently in each modulation scheme. Modulation Index is denoted by μ symbol.

How to evaluate Modulation Index using this online evaluator? To use this online evaluator for Modulation Index, enter Amplitude of Modulating Signal (A_m) & Amplitude of Carrier Signal (A_c) and hit the calculate button.

FAQs on Modulation Index

What is the formula to find Modulation Index?

The formula of Modulation Index is expressed as Modulation Index = Amplitude of Modulating Signal/Amplitude of Carrier Signal. Here is an example- 0.36 = 6.12/17.

How to calculate Modulation Index?

With Amplitude of Modulating Signal (A_m) & Amplitude of Carrier Signal (A_c) we can find Modulation Index using the formula - Modulation Index = Amplitude of Modulating Signal/Amplitude of Carrier Signal.

What are the other ways to Calculate Modulation Index?

Here are the different ways to Calculate Modulation Index-

Modulation Index=sqrt(2*((Average Total Power of AM Wave/Average Carrier Power of AM Wave)-1))
Modulation Index=Amplitude Sensitivity of Modulator*Amplitude of Modulating Signal
Modulation Index=(Maximum Amplitude of AM Wave-Minimum Amplitude of AM Wave)/(Maximum Amplitude of AM Wave+Minimum Amplitude of AM Wave)

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Modulation Index Formula

​GoModulation Index with respect to Power Formula

​GoModulation Index with respect to Amplitude Sensitivity Formula

Modulation Index Example

Modulation Index Solution

Modulation Index Formula Elements

Other Formulas to find Modulation Index

Other formulas in Fundamentals of Analog Communications category

How to Evaluate Modulation Index?

FAQs on Modulation Index

Variable Name

GoModulation Index with respect to Power Formula

GoModulation Index with respect to Amplitude Sensitivity Formula