Instructions for Phase Modulation (PM)

Step 1: Click on 'Generate Message' button to generate input message signal
Step 2: Then click on 'Generate Carrier' button to generate carrier signal
Step 3: The carrier frequency has to be more than the message frequency and You can change frequencies using sliders
Step 4: Click on 'Generate Phase Modulated Signal' button to generate Phase Modulated Signal
Step 5: Click on the 'Show Frequency Spectrums of PM' button to see spectrums of the PM signal
Here, β represents the phase modulation index, given by β=kp*Am, where Am is the amplitude of the message signal (assumed to be fixed), and kp is the phase sensitivity of the modulator

Message Frequency (Hz)

Carrier Frequency (Hz)

Kp (phase sensitivity):

β (kp*Am) =

Instructions for Phase Demodulation

Step 1: You can Demodulate the PM Signal clicking on the 'Perform phase Demodulation' button
Step 2: Click on the 'Show Frequency Spectrums of Original and Demodulated Signal' button to see spectra of the message and demodulated signal. The frequency spectra is shown for a modulation index of 1