A PYTHON BASED GUI For AM Modulation

Amplitude modulation (AM) is a signal modulation technique that is widely used by radio stations for transmitting their programmes.

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This project proposes a Python GUI based simulator to study AM. A user can vary various parameters—such as modulation index, amplitude and frequency of modulating signal, and carrier signal—and observe the output. The project can be used to simulate the signal modulation by radio engineers for designing different carrier signals and their modulation and demodulation.

This GUI is developed in Python 3.10.1 by using Jupyter Notebook. As only two components are used for the project, as shown in the bill of material, there is no need of any circuit diagram. Just connect the LCD to Raspberry Pi via an HDMI cable connector.

For amplitude modulation, the carrier waveform is modulated according to instantaneous amplitude of the message (baseband) signal. To understand, let us consider a sinusoidal wave as the message signal that needs to be transmitted. Let us say, the amplitude of message signal is Am and its frequency is fm. The mathematical time-domain representation of the message signal would be: m(t) = Am.cos (2π/ƒmt) ........Eq 1

The carrier signal is a high frequency radio wave with amplitude Ac and frequency fc, which is represented by: c(t) = Ac.cos (2π/ƒct) ........Eq 2

The equation of modulated waveform is:

The modulation index defines modulation level, which can be defined as: