Frequency Modulation thing. How to solve it?

Hello!

I have a VI that is frequency modulation using two nodes of formula. A node is for the generation of Message signals and the second node form - generation of FM resulting. Equations of observation of FM, the position within the equations of FM - should be instegrated and FM is like:

FM (t) = A * cos (2 * pi * Fc + 2 * pi * D * Integral (shrub);)

, where A - amplitude; PI - 3,14; CF - carrier, shrub - message signal frequency; D - frequency deviation.

That's why I use external integration, then pass signals integrated into the equation of the FM.

The problem is - Signal has very low voltage (amplitude) after integration - and it no longer works.

Should I multiply signals part until it is the same amplitude as the original signal?

What could I have done wrong here?

Thanks in advance.

I created a polymorphic VI 'Generation FM'. This frequency-modulated signal output generates VI according to wired signal Message. Generation VI FM accepts two types of Message report entered - waveform or a table. If you wire up a table for Message intput - you will also need to "Sampling frequency" input wire. Now everyone can put this polymorphic function on their pallet pattern and use it.

Note: You need to put on a VI block diagram called "FM Generation.vi", two other files ".vi generation FM (table)" and "Generation FM (waveform) .vi" are instances of function that are responsible for entries or entry level waveform.

This feature is designed for LabView 7.1 or higher.

Do not hesitate to write feedback.

Tags: NI Software

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