Speech quality assessment in visible light communications

For speech signal transmission to be efficient and successful, which implies that the quality of the speech signal on the receiving end is satisfactory, it is crucial to ensure sufficient bandwidth and transmission speed. In this regard, Visible Light Communications (VLC) could represent an adequate solution for speech signal transmission over visible light. Error detection and correction are digital communication techniques commonly applied for the reliable transmission of digital data over noisy communication channels, and their application in VLC is of great importance. In this paper, the quality of the speech signal transmitted over the VLC system is assessed using the Perceptual Evaluation of Speech Quality (PESQ) and the Virtual Speech Quality Objective Listener (ViSQOL) metrics. The Hamming and Reed-Solomon (RS) channel coding techniques are analyzed, and experiments showed that using both coding techniques resulted in a speech signal quality improvement.