The Circuit Design Of Audio And Video Signals Acquisition And Transmission Interface

Nowadays,with the development of multimedia technology,acquisition and transmission of audio and video data are more and more widely used.We can obtain a lot of audio and video information every day.In addition to the higher quality requirements of audio and video,the data acquisition and transmission efficiency of audio and video also have higher requirements.In this paper,a kind of audio and video signal acquisition and transmission interface circuit is designed based on the requirements of the project.This design is based on DM365 and FPGA combined platform.The advantages of DM365 in the processing of audio and video signals and the advantages of FPGA to realize the business logic and transmission interface protocol are fully utilized.The main contents of this paper are as follows:The stage of circuit design and implementation of DM365 and FPGA platform mainly includes DM365 and FPGA minimum system design as well as audio and video acquisition circuit design.the audio and video acquisition boards and DM365 platform boards are designed with plug-type hardware.The size of the board card is small,and it is convenient to upgrade later.Any one of the two channel CVBS or S terminals in the video signal and double audio channel analog audio can be acquired by the audio and video acquisition circuit,and then the digital audio and video signals can be obtained.The stage of data transmission interface design based on FPGA mainly includes the EMIF interface,the customized SPI interface,and the PCI interface for communication with the upper computer.A number of cache modules are designed to cache the data.Among them,the customized SPI interface can realize the data access of SPI-RAM.Output controllable FIFO design realizes the control of the quantity of output data.Therefore,the transmission interface circuit in this design is more flexible in data cache and transmission.The designed transmission interface is mainly used to transmit the audio and video data.In the last,the audio and video acquisition circuit and data transmission interface circuit designed are tested.The test results show that the circuit designed in this paper can realize the acquisition of audio and video data,as well as processing and interface transmission of audio and video data.And this circuit designed fully meets the project requirements.This circuit designed can be used in the monitoring system in a variety of application fields.And it can be further developed without changing the hardware.