Design And Implementation Of Audio And Video Communication Experimental Device Based On 4G

With the rapid development of global 4G mobile communication technology,The coverage of 4G mobile network is becoming larger and larger,The number of 4G user is becoming bigger and bigger and 4G-based applications are also emerging.One of the most typical application is 4G mobile audio and video services.At the same time,the demand standard and required quantity for engineering technical personnel in the field of 4G mobile audio and video become higher and higher.In order to train high-level talent with4 G mobile audio and video technology,research and design of a 4G-based audio and video communication experimental device is very necessary.Most of the existing mobile communication experimental devices are based on the backward 3G networks,which doesn't confirm to the development trend of the mobile communication industry.There is also a small part based on 4G network while the design experiments are mostly based on verification projects.It's lack of design and development and doesn't accord with the requirements of innovative education.The 4G-based audio and video communication experimental device designed in this paper will be used for the teaching of mobile communication experiment course.It is a part of the project of 4G mobile communication innovation experiment platform construction and application.This device makes up the deficiency of the existing mobile communication experimental devices in the market and designs a lot of innovation.The main contents of this paper are as follows:(1)Analyzing the functional requirements of the experimental device.This experimental device mainly implement full-duplex voice calls and video capture upload function based on 4G mobile communication network.According to functional requirements,we select TMS320DM365 chip which is produced by TI corporation as the main chip of the experimental device,and select Huawei ME909u-521 module as the 4G network access module of the experimental device.(2)Designing the hardware circuit of the whole experimental device system.We design a microphone amplifier circuit and an echo cancellation module circuit in order to solve the problem of small volume and echo in the full-duplex calling.We design a CMOS and CCD dual-camera capture circuit in the video capture module.We design the PCB layout of this experimental devise which is adopted the design of “core board + bottom board + expansion module”.(3)Based on the Linux embedded system,the audio,designing the software of audio,video and 4G modules of the experimental device,which mainly including the device-driven development and the software design in application layer.In this paper,we design a dual-camera software switching technology for the dual camera capture scheme.Through debugging and testing,This audio and video communication experimental device implements expected function and effect.Finally,we design two experiment examples based on this experimental device.