Here is a YouTube video about SYNCHRONOUS DETECTION OF AM WAVE, and is part of a growing collection of videos I have found to be useful. The reason is discussing the engineering concepts behind synchronous demodulation of AM signals and understanding science related to software defined radio.
This tutorial, "SYNCHRONOUS DETECTION OF AM WAVE" is free education you can watch, which will help you deepen your knowledge and be better prepared for licence exams, schoolwork, or operating radio equipment.