I have Frequency Modulated (FM) Signal, with carrier frequency 1000Hz and message signal frequency 20Hz. I want to downconvert FM signal frequency to 200Hz. I searched through the forum and google and didn't find anything where would be at least algorithms or Math equations. How to downconvert FM signal?
The aim is down convert signal to low frequencies where it is easier to filter from noise.
You could try using the Scale Delta t VI (Functions >> Programming >> Waveform). As the help says, "Multiplies the delta t component of the waveform by the specified scale
factor. Generally, this lengthens or shortens the sample rate of the
You could also take a look at the Resample Waveforms (continuous) VI (Functions >> Signal Processing >> Waveform Conditioning.
I hope this helps.
Vivek Nath National Instruments Applications Engineer