Design and Implementation of Speech Transmission System based on Visible Light

Abstract

Using visible light communication technology to transmit Ethernet signals can overcome the shortcomings of traditional wireless communication, such as low rate, limited spectrum resources and limited application scenarios. Aiming at the problem that traditional visible light communication system is difficult to realize high-speed Ethernet communication, a speech transmission scheme based on visible light is proposed. The structure of important electronic components and the design details of each circuit are described in detail, focusing on the connection mode, realization function and working principle of each circuit module. Finally, the whole system is tested, and the test methods and test results of all circuit modules are described. The experimental results show that the audio signal can be modulated to visible light by LED lamp and restored to audio signal by photodiode demodulation, so as to realize wireless transmission.