VoIP G.711 Mu-Law - RTP - Channel Loss Simulation

An app for simulating a VoIP channel with G.711 μ-law comp, RTP labeling, packet loss, jitter, noise, adapt. gain, MOS/SNR calc. and export.

A MATLAB App for simulating a VoIP communication channel with G.711 μ-law compression, packet loss, jitter, noise, and adaptive playback. Includes smart packet concealment, AGC filtering, waveform visualization, MOS/SNR calculation, and audio export.

This MATLAB App simulates a real-time VoIP (Voice over IP) communication channel and provides an interactive environment to test the effects of various network impairments and audio processing techniques on voice quality. The application allows users to:

• Import voice recordings in WAV format.
• Compress audio using G.711 μ-law encoding with 8-bit PCM.
• Divide the audio stream into packets and apply RTP-like labeling.
• Simulate network conditions by specifying:
• Packet loss rate
• Jitter (standard deviation)
• Maximum jitter buffer delay tolerance
• Noise variance
• Optionally apply smart packet concealment techniques for missing packets.
• Filter and normalize the voice using Adaptive Gain Control (AGC).
• Visualize both the input and output waveforms.
• Play and pause both the original and processed audio, with real-time switching between them.
• Monitor the output volume level in real-time.
• Calculate and display SNR (Signal-to-Noise Ratio) and MOS (Mean Opinion Score) values.
• Show statistics including total number of packets, played packets, and lost packets.
• Save the final processed audio as a WAV file.

This app is ideal for researchers, educators, or students exploring VoIP systems, digital signal processing, or network-induced voice quality degradation.

• Created by Arda Güler
• Yildiz Technical University
• Electronics and Communication Engineering Student
• Apr 2025