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. The carrier frequency has to be more than the message frequency and You can change frequencies using sliders
Step 3: Click on 'Generate Phase Modulated Signal' button to generate Phase Modulated Signal
Step 4: 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)

Step 1:

Carrier Frequency (Hz)

Step 2:

Kp (phase sensitivity):

Step 3:

Step 4:

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