Instructions for Frequency Modulation (FM)

Step 1: Click on 'Generate Message' button to generate input message signal
Step 2: Then click on 'Generate Carrier' button to generate carrier signal. The carrier frequency has to be more than the message frequency and You can change frequencies using sliders
Step 3: Click on 'Generate Frequency Modulated Signal' button to generate Frequency Modulated Signal
Step 4: Click the 'Show Frequency Spectrums' button to view the FM spectra.
Here, β represents the frequency modulation index, given by β = kf*Am/fm, where Am is the amplitude of the message signal (assumed to be fixed), fm is its frequency, and kf is the frequency sensitivity

Message Frequency (Hz)

Step 1:

Carrier Frequency (Hz)

Step 2:

Kf (frequency sensitivity):

Step 3:

Step 4:

Instructions for Frequency Demodulation

Step 1: LPF's Cutoff frequency works in accordance with the Message frequency
Step 2: You can Demodulate the FM Signal clicking on the 'Perform FM Demodulation' button
Step 3: Click on the 'Show Frequency Spectrums' button above to see spectra of the message, FM modulated and demodulated signal. The frequency spectra is shown for a modulation index of 1