This document summarizes an experiment on amplitude modulation, demodulation, and envelope detection. An AM signal was generated by modulating a carrier wave with a message signal, then demodulated using two different methods. First, low-pass filtering was used for demodulation, which successfully recovered the original sine and triangle wave signals. Second, a synchronous detector with the carrier signal was used, which also recovered the original signals despite noise issues due to a malfunctioning signal generator. The experiment demonstrated the principles of AM modulation and different demodulation techniques.