Dual-Tone Multi-Frequency (DTMF) Telephone Keypad Development with MATLAB GUI

This document outlines the core objectives for developing a comprehensive DTMF system implementation: • Design a MATLAB Graphical User Interface (GUI) that replicates a DTMF telephone keypad. The interface should incorporate two main components: a DTMF signal generator that produces dual-frequency tones corresponding to key presses using sine wave synthesis, and a DTMF tone detector that analyzes incoming signals through digital signal processing techniques. • Simulate DTMF signals with additive noise based on provided specifications, requiring implementation of noise modeling algorithms (such as white Gaussian noise) to create realistic communication channel conditions for testing detection robustness. • Decode and visualize DTMF signals utilizing the Fast Fourier Transform (FFT) algorithm for frequency domain analysis. This involves implementing spectral peak detection methods to identify the two dominant frequencies in each DTMF tone and mapping them back to corresponding keypad digits. Successful project completion requires focused implementation of these three interconnected components, with particular attention to real-time signal processing efficiency and accurate frequency detection thresholds in the decoding algorithm.