AM USING PYTHON

Aim:

To implement and analyze amplitude modulation (AM) using Python's NumPy and Matplotlib libraries.

Apparatus Required:

Software: Python with NumPy and Matplotlib libraries Hardware: Personal Computer

Theory:

Amplitude Modulation (AM) is a technique used in electronic communication, primarily for transmitting information via a radio carrier wave. In AM, the amplitude of the carrier wave is varied in proportion to that of the message signal. The general form of an AM signal is:

Program:

import numpy as np
import matplotlib.pyplot as plt

am=6.6
fm=554
ac=13.2
fc=5540
fs=55400
t=np.arange(0, 2/fm, 1/fs)

m = am * np.cos(2 * np.pi * fm * t)
plt.subplot(3,1,1)
plt.plot(t, m)

c = ac * np.cos(2 * np.pi * fc * t)
plt.subplot(3,1,2)
plt.plot(t, c)

s = (ac + m) * np.cos(2 * np.pi * fc * t)
plt.subplot(3,1,3)
plt.plot(t,s)
plt.title("AM")


plt.tight_layout()
plt.show()

Output Waveform:

Tabular Column:

Algorithm:

1. Initialize Parameters: Set the values for carrier frequency, message frequency, and sampling frequency.
2. Generate Time Axis: Create a time vector for the signal duration.
3. Generate Message Signal: Define the message signal as a cosine wave.
4. Generate Carrier Signal: Define the carrier signal as a cosine wave.
5. Modulate Signal: Apply the AM formula to obtain the modulated signal.
6. Plot the Signals: Use Matplotlib to plot the message signal, carrier signal, and modulated signal.

Result:

The message signal, carrier signal, and amplitude modulated (AM) signal will be displayed in separate plots. Thus AM is implemented using numPy and Matplotlib.