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
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 Frequency Modulated Signal' button to generate Frequency Modulated Signal

BUFFER AMPLIFIERS

A

k1.A

B

k2.B

VCO

DATA

TTL

Vin

sin(wt)

Message Frequency

1

Carrier Frequency:

10

Kf:

50

Frequency Counter

ANALOG

TTL

TTL Enable

reset

Variable DC

+5V

DC

GND

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 to see spectrums of the message, FM modulated and demodulated signal

Msg out

FM Input

UTILITIES

REF

COMPARATOR

RECTIFIER

DIODE + LPF

RC LPF

TWIN PULSE GENERATOR

ERROR

Q2

WIDTH

DELAY

CLK

Q1

HEADPHONE AMPLIFIER

LPF SELECT

IN

OUT

LPF

K

A

KA