GUI MATLAB APPLICATIONS FOR AM SIGNAL ANALYSIS

Abstract

Amplitude modulation (AM) is merging process of  carrier signal with information signal  in which the carrier amplitude transmitted is changed according to information signal amplitude. One way to understand the mechanism of the AM signal is understanding the physical characteristics of the AM signal. This is not an easy thing for because the AM signal involve complex mathematical equations.

The software used is the Matlab GUI. The analysis is done by first determining the mathematical equation of AM signal and the component of signal parameters, namely amplitude and frequency. Next, create a design template figure, set the properties of each UIControl component, making the program listing and then analyzed by entering the parameter values ​​of different signal amplitude to produce variation modulation index value (m_A), there are  0.25, 0.5, 1 and 1.5. Information frequencies used are 250 Hz and 500 Hz, and the carrier frequencies are 1.5 kHz and 400 Hz.

The results of the analysis show that the limits of the ideal modulation index value (m_A) is: 0 £ m_A £ 1 with the frequency of the carrier signal should be higher than the information signal.