MATLAB Simulation of Dual-Tone Multi-Frequency (DTMF) Dialing System

MATLAB simulation of a Dual-Tone Multi-Frequency (DTMF) dialing system serves as a valuable approach to visually demonstrate the waveforms generated by each numeric key. This simulation method helps in better understanding the relationship between digital keys and their corresponding waveforms, thereby providing deeper insights into the working principles of DTMF dialing systems. The implementation typically involves generating two sine waves with specific frequency pairs (low-group and high-group frequencies) using MATLAB's signal processing functions, combining them additively, and plotting the resultant composite waveform. By modifying the frequency pairs assigned to different keys, researchers can study variations between waveforms and investigate the performance characteristics of DTMF systems. Through MATLAB simulation of DTMF dialing systems, we can gain comprehensive understanding of system operation principles and features, providing valuable references for the application and development of DTMF technology. Key functions commonly used include sin() for waveform generation, plot() for visualization, and sound() for audio output verification.